Ordnance provision system. Ordnance catalog (ordnance provision system): Group C. Howitzer. 105-mm, M2A1, and mount, howitzer, 105-mm, M4, major items, maintenance parts and equipment required for maintenance of howitzer, 105-mm. M2A1, mechanism, recoil, howitzer, 105-mm, M13, and mount, howitzer, 105-mm, M4, addendum; Dec. 18, 1942.

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