The Martin B-10 was the first all-metal monoplane bomber to be regularly used by the United States Army Air Corps entering service in June 1934. It was also the first mass-produced bomber whose performance was superior to that of the Army’s pursuit aircraft of the time.The B-10 served as the airframe for the B-12 B-13 B-14 A-15 and O-45 designations using Pratt & Whitney engines instead of Wright Cyclones.A total of 348 of all versions were built.
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