Ordnance provision system. [Ordnance catalog (ordnance provision system): Group E, Gun, 6-in., M1903A2 and M1905A2, and carriage, gun, barbette, 6-in., M1, major items, maintenance parts and equipment required for maintenance of carriage, gun, barbette, 6-in., M1, addendum; Jan. 7, 1943.

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