1. Federal standard stock catalog: sec. 4, pt. 5, Federal specification. WW-C-571. Conduit, steel, rigid, enameled, amdt. 2; Oct. 20, 1949. Bookmark Corporate/Agency Authors: Federal Supply Bureau and General Services Administration Publisher: Federal Supply Bureau Date: [1949.] SuDoc number: T 51.7/8:WW-C-571/amdt.2