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Keywords: LeatherResearch 025.jpg A dumbbell shaped specimen was used to ensure failure within a restricted portion of the sample where the stretch was measured by means of dividers The breaking strength of heavy leathers varied from 500 to 800 pounds per inch of width National Institute of Standards and Technology 1919-01-01 National Institute of Standards and Technology PD-USGov-NIST PD-USGov National Bureau of Standards National Institute of Standards and Technology Leather Leather shoes |