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Boeing Aircraft Co.
The FB series of U.S. Navy fighters began with the Boeing Model 15 prototype in 1923. The Army procured several examples of the promising design, which it designated the PW-9. The Navy closely followed the Army's testing of the aircraft and added an order for 14 to an Army contract in late 1924. The Navy designated their airplane the FB 1. The FB-2, FB-3, and FB-4 were simply FB-1s modified to test different components.
Boeing Aircraft Co. · 1954