Ordnance provision system. Ordnance catalog (ordnance provision system): Group C, Gun, 57-mm, M1, and carriage, gun, 57-mm, M1 and M1A1, major items, maintenance parts and equipment required for maintenance of gun. 57-mm. M1, and carriage, gun. 57-mm, M1 and M1A1, addendum-Jan. 6, 1943.

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