Keywords: LeatherResearch 003.jpg Class VII- organic and fibrous; 4-leather Series of vats and incidental tanning equipment used for investigating the merits of materials for tanning and for preparing standard leather samples under controlled conditions for chemical and physical research National Institute of Standards and Technology 1927-01-01 National Institute of Standards and Technology PD-USGov-NIST PD-USGov National Bureau of Standards National Institute of Standards and Technology Leather Leather shoes |