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Re: 37mm M1 or M1A2 anti-aircraft
Not much but in case it helps, from TM 9-1235, the July 1942 version:
I'm looking for plans for the 37mm M1 or M1A2 anti-aircraft weapon used by the US Army during WWII. Based on action reports, it was fitted to a number of Higgins PTs in RON20. So far, online searches have not turned up any. This is a totally different weapon than the M3 anti-tank gun and the M4/M9 weapons fitted to PTs.
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