Training Manual, 37mm M4 Automatic Aircraft Cannon
This is an original WWII-era training manual for the Oldsmobile-manufactured 37mm M4 Automatic Cannon. This manual was used in the training of armorers in the US Army Air Force and the US Navy. The 37mm M4 cannon was installed in the P-39 Airacobra and P-63 King Cobra fighters, as well as on some US Navy PT Boats.
This 77-page manual describes the gun and its subassemblies, service and maintenance, and parts list. It is in reasonably good condition given its age. Contains some pencil mark-ups.