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Keystone B-3
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==Design and development== The B-3 was originally ordered as the '''LB-10A''' (a single-tail modification of the [[Keystone LB-6]]), but the Army dropped the ''LB-'' 'light bomber' designation in 1930. Although the performance of the B-3A was hardly better than that of the bombers flown at the end of [[World War I]], it had come a long way in terms of flight safety.
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