20-MM aircraft gun matériel M1 and M2. (open access)

20-MM aircraft gun matériel M1 and M2.

"In addition to a description of the 20-mm aircraft gun matériel M1 and M2, this manual contains technical information required for the identification, use, and care of the matériel."
Date: April 2, 1942
Creator: United States. War Department.
System: The UNT Digital Library