1. Ordnance provision system. Ordnance catalogue (ordnance provision system): [Group A], Gun, machine, cal. .30, Browning, M2, aircraft, fixed and flexible, Changes 1; Aug. 8, 1934. Bookmark Corporate/Agency Authors: Ordnance Department and War Department Publisher: Ordnance Department Date: [1934.] SuDoc number: W 34.28:A-28/2/ch.1