"The Martin Upper Turret Models A-3, A-3-A, A-3-B, A-3-C, A-11", Briggs Manufacturing Company, September 18, 1943, 104p. Briggs was contracted to make the Martin Upper Turret for the B-24 bomber. Martin needed more manufacturing capacity, so it was contracted out to Briggs and others for replication. This is their own training manual.
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