581. Federal standard stock catalog:sec. 4, pt. 5, Federal specifications. WW-C-621a. Couplings, hose, cotton (rubber-lined) and linen (unlined), amdt. 2; Nov. 14, 1950. Bookmark Corporate/Agency Authors: Federal Supply Service and General Services Administration Publisher: Federal Supply Service Date: [1950.] SuDoc number: T 58.10/3:WW-C-621a/amdt.2