Ordinance provision system.[Ordnance catalog (ordnance provision system: [Group F], System, data transmission, for director, M1, system, data transmission, M2 (for director, M1A1 or M2) system, data transmission, M2A1 (for director, M2) system, data transmission, M2A2 (for director, M2), Changes 1; Oct. 6, 1941.

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