Ergonomic Guidelines For Common Job Functions Within The .

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Ergonomic Guidelines for CommonJob Functions Within TheTelecommunications IndustryPrepared by the National TelecommunicationsSafety PanelErgonomics SubcommitteeIssued November 2007

DisclaimerThis document has been developed by Safety representatives from majortelecommunications companies across the United States as a guideline for Ergonomicsin the telecommunications Industry. This guideline is based on our collectiveexperiences and is intended to assist telecommunications companies in developing theirown ergonomics program. Any adoption of these guidelines is made at the users’ owndiscretion and volition and in doing so the users are forewarned that the guidelines arenot guaranteed to reduce and / or prevent ergonomic illnesses. Companies in ourindustry are free to adopt or reject this guideline. Neither the adoption nor the rejectionof this guideline shall be construed as an admission that our industry has an ergonomicissue. No third party shall have the right to enforce or benefit from this guideline. No thirdparty may force any company within our industry to adopt or reject this guideline for anypurpose (s). Furthermore, the guideline lacks the force of law and may not be usedagainst our industry by any regulatory agency.This document is not intended to be construed as a recommendation to anymanufacturer to modify or change any of its products to conform to the guideline. Thisdocument does not represent any commitment by the developers to purchase anyproduct, whether or not it provides the described characteristics of this guideline.Nothing contained herein shall be construed as conferring by implication, estoppel orotherwise any license or right under any patent, whether or not the use of anyinformation herein necessarily employs an invention of any existing or later issuedpatent.The developers of this document do not recommend products and nothing containedherein is intended as a recommendation of any product to anyone.Special thanks to the Developers of this DocumentJohn Quinlan *Marie Robinson *Eric AllgaierLynn AlpaughFrank BannisterMarshall BerryArt FarmerKathy TurnerLaura Kiser* Co-ChairsVerizonAT&TSprint NextelAT&TSprint NextelAT&TCincinnati BellAT&TAT&T

Table of ContentsIntroductionA-1Ergonomics Program ElementsB-1Outside Plant EnvironmentC-1Handling Extension LaddersC-2Handling Lashing MachineC-5Removing and Replacing a Manhole CoverC-7Splicing CableC - 10Placing Equipment into and out of a ManholeC - 13Handling Cable ReelsC - 15Collecting Coin BoxesC - 17Pole ClimbingC - 20Power ToolsC - 23Jack HammerC - 26Handling Equipment in Aerial OperationsC - 30Handling Compressed Gas CylindersC - 33Sawing a Utility PoleC - 36ShovelingC - 39Driving a VehicleC - 43Central Office EnvironmentD-1Wire Wrapping / UnwrappingD-2Wire StrippingD-5Working on a Ladder in the Central OfficeD-8Handling Wire ReelsD -11Pushing and Dragging MaterialD -13Kneeling while WorkingD -16Climbing a Ladder in the Central OfficeD -18Office EnvironmentE–1TypingE-2Mousing and Alternative Input DevicesE-8SittingE - 14ReachingE - 19

Phone UseE - 23Viewing MonitorE – 27Writing in a computer environmentE – 32Using a Laptop ComputerE – 39Retail EnvironmentWireless Retail OperationsF-1F-2Glossary of TermsG-1AppendicesAlliance Between OSHA and the National TelecommunicationsSafety Panel (NTSP)Related website SHA News Release “National Telecommunications SafetyPanel Aligns with OSHA”Exercises for the Office Environment

IntroductionBackgroundThis document has been developed by the National Telecommunications Safety Panel(NTSP) Ergonomics Subcommittee. The NTSP is a consortium of safety professionalsrepresenting the telecommunications industry whose goal is to promote employeesafety and health while preventing on the job injuries.The NTSP Ergonomics Subcommittee brought forth their knowledge and experiences todevelop a set of guidelines that are intended to assist other telecommunicationscompanies in developing their own ergonomics program. This significant industry effortbegan in 2000 and is considered an iterative process whereby the document willcontinue to be revised and expanded upon as new information becomes available. Theguideline provides information pertaining to the science of ergonomics and its impact onthe telecommunications industry. It is organized into 4 main sections by work type withinthe telecommunications industry; Outside Plant Environment, Central OfficeEnvironment, Office Environment, and Retail Environment. Each section is furtherorganized by common job functions within the industry and describes various workrelated musculoskeletal disorder risk factors and strategies for reducing or mitigatinghazards. Also included in the document are a Glossary of Terms, information on theNTSP/OSHA Alliance, and recommended exercises for the office environment.IntroductionErgonomics is the study of the way people, their equipment, tools, and the environmentwork together. Ergonomics seeks to adapt the environment in order to ensure people’sproductivity, comfort, and safety. The word ergonomics comes from the Greek wordergon meaning work, and nomos meaning laws. In other words, ergonomics literallymeans the laws of work.One type of injury that may be avoided by eliminating risk factors in the workenvironment is a Work-related Musculoskeletal Disorder (WMSD) or CumulativeTrauma Disorder (CTD). WMSDs refer to disorders of the soft tissues, including those ofthe muscles, tendons, and nerves. WMSDs are associated with repeated exertions, ormovements of the body, awkward postures, and extreme force.WMSD risk factors can be found in activities both on and off the job, and can lead tomuscle fatigue. Fatigue commonly leads to discomfort, and to a reduction in endurance,strength, and muscle control.The differentiating factor between a WMSD and another type of injury is the acutenessof the injury. Acute trauma refers to injuries that occur immediately such as cuts, bruises,and falls. Some cumulative trauma injuries may appear to be sudden, but can be theresult of chronic exposure to WMSD risk factors over time.Exposure to WMSD risk factors can be correlated with the development of WMSDs.These WMSD risk factors are not necessarily causative, but research has shown anassociation or relationship. The mere presence of a WMSD risk factor does notnecessarily constitute the development of a WMSD. It is theorized that the likelihood ofA-1

developing a WMSD is greater with a higher exposure to a greater number of riskfactors.WMSD Risk FactorsListed below are examples of potential WMSD risk factors.WMSD Risk FactorsDescriptionStatic PostureMaintaining a stationary position for extended periods of time.Such as standing in place or holding the arm away from thebody.Awkward PostureAny fixed or constrained body positions other than neutralalignment. Neutral posture occurs when the natural tensions ofthe muscles are relaxed. If an extreme posture is sustained orcombined with high forces, it can place a person at a greaterrisk of injury.RepetitionHigh numbers of similar body part movements. Repetitivemotion can combine with fatigue, force and posture to increasethe risk of injury.Forceful ExertionExcessive force or strength used to perform a job, as ingripping or lifting. Force can be applied by an object to a bodypart, or internally within the body such as compression of thediscs of the back.Contact StressLong-term pressure on soft tissue and underlying nerves, suchas the palm or forearm.Excessive VibrationVibrations are most commonly transmitted to workers throughtools, controls, or contact with vibrating work surfaces. Vibrationprimarily affects circulation and nerve function.Extreme ColdTemperaturesCold is typically transmitted to the person from tools, worksurfaces, and the environment. The primary effect of cold isthat it triggers the body’s natural response to reduce circulationto the affected area.Work StructureA person’s work structure is defined by job factors such asorganization design, job design, incentive systems, andmanagement policies and styles. Research has shown thatthese variables can affect the incidence of WMSDs.Non-occupationalActivitiesIndividual FactorsNon-occupational activities can sometimes expose a person tomany of the risk factors described above.Certain medical conditions and anatomical differences areknown to increase an individual’s risk of developing a WMSD.A-2

Principles of Good Body MechanicsOne of the ways we can enhance safety is by using our own bodies as effectively andefficiently as possible through the use of the principles of good body mechanics. Hereare some general tips to keep in mind:B.Back Maintain the natural curves of your back/spine Pay particular attention to the normal inward curve of your lower back (thelumbar region)A.Arms Keep your arms as close to your body as possible Hold the weight close to your body and at waist height Remember to keep elbows in and palms up (or in neutral) to stabilize theshoulder jointT.Twisting Avoid trunk twisting Move your feet by pivoting or side-stepping Keep in mind that if your shoulders are not positioned in the same plane asyour hips, your trunk is twistedB.Base of Support Place your feet shoulder width apart and staggered (one slightly in front ofthe other)L.Legs Use the large muscles of your legs and buttocks to generate the force formovement; use your own body weight as a counter-weight Bending at the hips and the knees allows your leg and buttocks muscles tobe activeE.Evaluate Think before you act Evaluate your load and the environmentIt may be difficult to adhere completely to every principle every time. However, bykeeping these principles in mind, you have the ability to set up each situation using asmany principles as possible to enhance the safety of yourself.ResourcesOSHA Alliance with tmlProfessional AssociationsAmerican Industrial Hygiene Association (AIHA) http://www.aiha.org/American Society of Safety Engineers (ASSE) http://www.asse.org/A-3

National Safety Council (NSC) http://www.nsc.org/National Telecommunications Safety Panel http://www.telsafe.org/Human Factors and Ergonomics Society http://www.hfes.orgGovernmental and Standards AgenciesAmerican National Standards Institute http://www.ansi.org/American Public Health Association (APHA) http://www.apha.org/public health/Centers for Disease Control and Prevention (CDC) http://www.cdc.govConstruction Occupational Safety & Health – Electronic Libraryhttp://www.cdc.gov/niosh/elcosh/Department of Energy http://tis.eh.doe.govLegislative Information on the Internet http://thomas.loc.gov/National Institute for Occupational Safety and Health (NIOSH)http://www.cdc.gov/niosh/homepage.htmlState Regulations & Activity:State Ergonomics ate plan.htmlFederal Occupational Safety & Health Administration (OSHA) http://www.osha.govA Four-Pronged, Comprehensive ApproachEffective ergonomics is part of OSHA's overall strategy for reducing workplaceinjuries and illnesses. OSHA has developed a four-pronged comprehensiveapproach to ergonomics that the agency believes will quickly and effectivelyaddress MSDs in the workplace. The four segments of OSHA's strategy forsuccessfully reducing injuries and illnesses from MSDs in the workplace are: The development of industry-or-task-specific ergonomic guidelines Enforcement Outreach and Assistance ResearchA-4

Ergonomics Program ElementsExperience has shown that successful ergonomic programs contain common elements.These elements typically include all, or some combination of, the following: Management CommitmentEmployee ParticipationRecognizing and Evaluating Risk FactorsControlling Risk FactorsTrainingHealth Care ManagementProgram EvaluationEach element is discussed in more detail below. Telecommunications companies areencouraged to utilize these elements and modify them as needed to meet the goals oftheir particular organizations. Successful ergonomics programs are characterized by adynamic approach where the objective is continual process improvement.Management CommitmentThe benefits of an ergonomics program, like all health and safety programs, are greatlyenhanced when management at all levels is committed to its success. Managementcommitment may be demonstrated by any or all of the following actions: A policy statement that recognizes the value of an ergonomics program to theorganization, defines goals to be achieved, and encourages employees toparticipate. Assignment of specific persons within the organization to take responsibility forthe various aspects of the ergonomics program. These persons should also beauthorized to take the appropriate actions necessary to achieve the goals of theprogram. Provide the resources necessary to implement the program. This may includeemployee time, tools, furniture, training materials, consultants, and/or otherresources as deemed appropriate to meet the specific ergonomic requirementsof the organization. Implement changes to the program as identified by employee feedback,injury/illness results, and/or periodic program review. Ensure the individualshaving responsibility for the ergonomics program meet regularly to understandwhether objectives are being met and modify elements as needed to attain thedesired outcome.Employee ParticipationErgonomics programs tend to achieve more positive results when employees activelyparticipate. The potential benefits of employee involvement include: 1qEnhanced worker motivation and job satisfaction,Added problem-solving capabilities,Greater acceptance of change,B-1

Greater knowledge of their work environment and organization.Employee input is valuable in understanding job functions more thoroughly, determiningpotential risk factors associated with jobs, and evaluating possible control measures.Participation methods will vary according to the size, labor status, department structure,existing knowledge, and geographic distribution of a particular organization.Participation may consist of group, individual activities, or both.Group participation typically consists of general safety teams, or teams specificallyformed to address ergonomic issues. Depending upon the size and characteristics ofthe organization, these teams may be organized on a company-wide, department, orwork group level. Team membership will vary depending upon the company and thegoals of the particular group, and may include: Safety and industrial hygiene personnel,Health care providers,Human resource personnel,Engineering personnel,Facilities and maintenance personnel,Ergonomics specialists,Management and hourly personnel,Labor representatives, if applicable.To ensure the success of an ergonomics team, the members should receive some basicinstruction on the following topics before beginning their efforts: The goals and expectations of the team and its members,Hazard recognition and control as it applies to ergonomicsBasic problem solving principlesAny limitations the team may be working under, e.g. budget.Individual employees should also be encouraged to participate in ergonomics programsby promptly reporting unsafe working conditions as well as promptly reporting any signsand symptoms of health problems that may be related to their work environment. Othermeans of encouraging individual participation could include employee surveys orsuggestion programs.Recognizing and Evaluating Risk FactorsIn order to implement ergonomic solutions, the jobs or job functions that pose possiblerisks must first be identified and evaluated. Definitions of ergonomic risk factors aredescribed in the Introduction section of this document and are discussed in detail in theCommon Job Functions section. Methods of gathering information about particular jobscould include: 2qReviewing injury reports, worker’s compensation claims, and medical reports forinjuries typically associated with ergonomic risk factors, or trends associated withparticular jobs.Logging worker complaints regarding pain or discomfort while performing acertain task, or complaints about tools or workstation design.Interviewing workers and supervisors about the job.B-2

Conducting walk-through surveys of the work environment.Using checklists to identify characteristics of the job function.Performing job hazard analyses.Job hazard analysis breaks a job into its various elements or actions, describes them,measures and quantifies risk factors inherent in the elements, and identifies conditionscontributing to the risk factors. A complete description of the job is obtained and the jobis broken down into a number of discrete tasks. Tasks can typically be described interms of the: Tools, equipment, and materials used to perform the job;Workstation layout and physical environment; andTask demands.Each task is then studied to determine the specific risk factors that may occur during thattask. Information may be gathered by: Observing and/or videotaping workers performing the tasks.Taking photos to illustrate work postures, workstation layout, tools, etc.Taking measurements of workstation parameters, (e.g. surface heights, reachdistances, etc.)Measuring tool handle sizes, weighing tools and parts, measuring tool vibration.Determining characteristics of work surfaces such as slip resistance, hardness,and sharp edges.Measuring exposures to heat, cold, and whole body vibration.Biomechanical calculations, (e.g. muscle forces required to lift, push, pull, etc.)Information gained from the job hazard analysis process and other sources can then beevaluated, prioritized, and utilized to implement hazard control strategies.Controlling Risk FactorsErgonomic risk factors may be minimized or controlled by utilizing one or a combinationof the following methods: Engineering controlsAdministrative controlsPersonal protective equipmentDetailed descriptions of control methods specific to tasks in the telecommunicationsindustry are discussed in the Common Job Functions section of this document.Engineering controls refer to changing the physical characteristics of the task and theyare the preferred method for controlling ergonomic risk factors. Examples of engineeringcontrols include, but are not limited to: 3qChanging the workstation layout, i.e. adjusting the seating height, work surfaceheight, reach distances, lighting, adding ancillaries such as footrests andkeyboard trays, etc.B-3

Using mechanical means to lift, hold and/or transport materials instead of manualliftingChanging the design of tools (handles, weight, etc.) to place less stress on theuserUsing power tools in place of manual toolsSubstituting lighter weight materials in the work processEliminating or minimizing sources of vibrationAdministrative controls are work practices and policies designed to prevent or minimizeexposures to risk factors. Administrative controls rely heavily on employee cooperationto be effective. These controls may be helpful as temporary measures until engineeringcontrols can be implemented, or when engineering controls are not feasible. Employeesmust be trained on the proper procedures and management must provide oversight ofthe process for it to be successful. Examples of administrative controls may include: Rotating workers from physically demanding jobs to less physically demandingjobsReducing shift length or scheduling more breaksTraining employees to recognize risk factors and avoid them whenever possibleEnsuring that employees are utilizing good postures and using tools & equipmentproperlyEvaluating the ergonomic characteristics of tools and equipment before they arepurchasedReviewing new job functions for ergonomic risk factors before they areimplementedRequiring two persons for handling heavy loadsVarying the job content to reduce repetitive movements and/or static posturesReducing the work pace of the jobInstructing employees on exercise and/or stretching techniquesPersonal protective equipment, such as wrist braces and back belts, is generallyconsidered to be the least effective means of controlling ergonomic risk factors andshould only be used under the guidance of a health care professional.TrainingTraining is an important component of any effective ergonomics program. The goal ofergonomics training should be to enable managers, supervisors, and employees toidentify aspects of job tasks that involve potential risk factors, recognize signs andsymptoms of possible ergonomic-related disorders, and participate in the developmentof control measures. It is generally recommended that all employees receive basicergonomics awareness training that may include any or all of the following topics: 4qHow to recognize ergonomic risk factors both on and off the jobHow to recognize signs and symptoms of musculoskeletal disorders (MSD’s) thatmay be related to the work environmentThe organization’s procedures for reporting job-related risk factorsGeneral principles for controlling ergonomic risk factors, (e.g. proper postures,lifting technique, etc.)B-4

In addition to the basic awareness training, employees who are involved in evaluatingjobs for risk factors, and recommending and implementing control measures, should beprovided more extensive training in such topics as: Ergonomic principles and identification of risk factorsMethods for performing job hazard analysesTypes of engineering controls that may be applicable to the jobTypes of administrative controls that may be applicable to the jobProblem solving proceduresTeam building techniquesHealth Care ManagementHealth care management and health care providers can be an important component of acomprehensive ergonomics program. Health care management is useful in promotingearly detection and prompt appropriate intervention and treatment of work relatedinjuries. In general, the earlier symptoms are identified and treated, the less likely amore serious disorder will develop. The health care provider should work closely withthe employer and be familiar with the operation as they can help to achieve these goals.Responsibilities of the health care provider may include: Promptly evaluating employees who report signs and symptoms of MSD’sRecommending appropriate treatment for employees diagnosed with MSD’sDetermining work restrictions for injured employeesAssisting with workplace accommodations for disabled employeesEnsuring the privacy of medical information as required by lawAssisting in the evaluation of control measures for ergonomic risk factorsProgram EvaluationErgonomics programs should be reviewed and evaluated periodically to determine ifthey are achieving the desired goals. Some of the factors that may be evaluated duringan overall ergonomics program review could include: The number of employees reporting signs and symptoms of MSD’sThe number of employees diagnosed with work-related MSD’sThe severity of work-related MSD’sChanges in productivity for particular jobsReview of employee suggestionsWhen program deficiencies are identified by the review process, appropriate measuresshould be implemented to correct any problems or enhance program effectiveness. Inaddition, when specific control measures are implemented, a follow-up evaluation shouldbe conducted to determine the effectiveness of the controls. One of the goals of asuccessful ergonomics program should be to strive for continuous improvement.References:National Institute for Occupational Safety and Health (NIOSH), 1997, Elements ofErgonomics Programs: A Primer based on Workplace Evaluations of MusculoskeletalDisorders.5qB-5

Ergonomic Guidelines for CommonJob Functions Within TheTelecommunications IndustryOutside Plant EnvironmentC-1

Ergonomic Guidelines for CommonJob Functions Within TheTelecommunications IndustryHandling Extension LaddersJob Function: HandlingExtension LaddersDescription of Work EnvironmentThis job function includes all aspects of working with and carrying extension ladders.Specifics include removing the ladder from the work vehicle, carrying the ladder to the jobsight, extending and placement of the ladder for work, collapsing the ladder and returning toand mounting on the vehicle. This function is normally performed outside in various typesof terrain and weather conditions.Removing ladderfrom vehicleCarrying ladder to andfrom job siteExtending andcollapsing ladderC-2

Handling Extension LaddersErgonomic Guidelines for CommonJob Functions Within TheTelecommunications IndustryRisk FactorsBodySegmentContributing FactorsForces on the SpineBackWeight of ladder (A typical 24’ fiberglass ladderwith rung and cable hooks weighs approximately60 lbs. and a 28’ , 300 lb rated, ladder weighsapproximately 67 lbs.)Awkward PosturesShoulderIcy, slippery conditions, unknown terrain,windy conditionsMethods of carrying the ladderContact stressHand /shoulderHard or sharp edges of the ladder can press onshoulder or fingersForceful exertionHandPulling rope and placing ladder into positionRecommended Solution Strategy - Short TermUse a two – person carry method for ladders over 28’Use a hand line over strand or comparable proceduresto raise and lower ladder on windy daysUse a pad on the shoulder or use a LadderTote (see resources) to keep sharp edges fromcontacting soft tissuesPlace indicator on ladder to show the center of balance to the employeeSuitcase handle on the side of ladder (Werner)C-3

Ergonomic Guidelines for CommonJob Functions Within TheTelecommunications IndustryHandling Extension LaddersRecommended Solution Strategy - Long TermReplace stationary ladder racks with rotational (Swing down) ladder racks (see resources)Provide a handle on the rear of the vehicle to assist employee’s stability while accessing theladderProvide lighter weight laddersUse a “ladder trolley” or ladder dolly where terrain or conditions permit (see resources)Use wheel steps or other “step-up” designs for better access to the ladder when in the rack (seeresources)Resources Which May Be Of Assistance For Ergonomic Design h.com/Swing-Down Ladder Rackwww.primedesign.netwww.masterack.comLadder Trolley Sur-LocIndustrieswww.surloc.comWheel StepsCurtis Industries1-800-555-2878C-4

Handling Lashing MachineErgonomic Guidelines for CommonJob Functions Within TheTelecommunications IndustryJob Function: Handling Lashing MachineDescription of Work EnvironmentThis function involves using a lashing machine, which typically weighs 50 to 100 lbs. andsecures telephone cable to steel support strand. The typical job involves transferring byhand, the lasher from the truck to a worker in a bucket or using a handline to pull the lasherup a pole to the working height. Once the lasher is at the working height, employees lift itfrom the bucket and place it on the strand. It can be pulled along either by hand ormechanical means (i.e. line truck) to secure the cable. The lasher must be lifted andtransferred around poles or other obstructions. Use of a lasher is along a pole line andtypically adjacent to a roadway. The lashing machine can be used during most weatherconditions, however it is typically used during non-inclement conditions.Primary Task#2Lasher hoisted to worker inbucketLasher is placed onto cableand pulled along by aground workerPrimary Task#3Lasher is taken from cableand placed in bucket andlowered to groundC-5

Ergonomic Guidelines for CommonJob Functions Within TheTelecommunications IndustryHandling Lashing MachineRisk FactorsBodySegmentContributing FactorsPulling forcesTwistingHigh speed/jerkingmovementsForward BendingBackWeight of the lashing machine (weight can rangefrom 50 to over 100 lbs.)Manual pulling of lashing machine by handManually lifting lasher into the bucket duringloading, unloading, and at transfer pointsRestricted movement in the bucket or on the poleforces bending and reachingMust bend at the waist to access lasherAwkward postureShouldersHandling lasher away from the body (i.e., armsextended)ForceHandsSetting up lasher, connecting towing ring snaphook, clamp openings, pulling gate.Recommended Solution Strategy - Short TermUse good body mechanics and lifting techniques whenever possible.Lower bucket to minimize torso bending while loading the lasherPosition bucket to minimize reach distancesRecommended Solution Strategy - Long TermUse the lightest lasher available, if possible.Investigate employing a mechanical lifting device to assist in lasher handling.Consider attaching a hoist to the bucket. One conception of the hoist would be to hang thelasher from a cable attached to the powered winch and a retractable boom. The retractableboom would allow the worker to guide the lasher around poles. This hoist could be used to liftother equipment to the bucket.Resources Which May Be Of Assistance For Ergonomic Design orAccommodationContact appropriate vendors for mechanical/powered lifting device /www.superwinch.com/C-6

Ergonomic Guidelines for CommonJob Functions Within TheTelecommunications IndustryRemoving and Replacing Manhole coversJob Function: Removing and ReplacingManhole CoversDescription of Work EnvironmentIn this task, the technician uses a tool with a hook on one end to unseat the manhole cover.This enables the technicians to pull and drag the cover away from the opening. There are avariety of different tools used to unseat the cover such as the J- Hook (a.k.a. B manholecover hook) and the Easy Pull (Fulcrum bar). This task is normally performed out doors andcan be affected by the environmental conditions such as rain, ice, snow, etc.Primary Task#2Employee using easypull tool to unseat themanhole coverEmployee using the JHook tool to unseat themanhole coverPrimary Task#3Employee using easypull tool to unseat themanhole coverC-7

Ergonomic Guidelines f

Jun 07, 2011 · Ergonomics is the study of the way people, their equipment, tools, and the environment work together. Ergonomics seeks to adapt the environment in order to ensure people’s productivity, comfort, and safety. The word ergonomics comes from the Greek word ergon meaning work, and nomos meaning la

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