JAN-G-479, JOINT ARMY-NAVY SPECIFICATION: GLASS, GROUND (FOR ORDNANCE USE) (17-JUL-1947)

JAN-G-479, JOINT ARMY-NAVY SPECIFICATION: GLASS, GROUND (FOR ORDNANCE USE) (17-JUL-1947)., This specification covers one grade of ground glass, furnished in five classes, A, B, C, D and E according to granulation, as specified in the contract or order.