Ordnance provision system. Ordnance catalog (ordnance provision system): Group D, Gun. 4.7-in., M1. and mount, gun. antiaircraft. 4.7-in., M1, major items, maintenance parts and equipment required for maintenance of gun, A. A., 4.7-in., M1, mechanism, recoil, T10, mechanism, recoil, T22, and mount, gun, antiaircraft, 4.7-in., ML addendum; Dec. 6, 1942.