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A Boeing B-17 used as the testbed for the Pratt & Whitney T-34 tuboprop engine. In 1945 the U.S. Navy funded the development of a turboprop engine. The T-34 was produced from 1951 to 1960, but never used in a U.S. Navy aircraft. The best known "user" was the
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552:پرت اند ویتنی تی۳۴
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