Title from March 1956 of former Piasecki Helicopter Corporation of Morton, Pennsylvania. Helicopter products included Model 107 (civil), and CH-46 Sea Knight for naval supply. The latter was built by Kawasaki in Japan in 1978 as KV-107/II. Nearly 600 Vertol H-21 Work Horse military transport helicopters, Model 43 (military export version) and Model 44 (commercial transport based on H-21) were completed. Tilt-wing Model 76 VTOL research aircraft evaluated by USAF as VZ-2. Model 114/CH-47 Chinook heavylift military helicopter begun by Vertol, but primary development and production by Boeing Vertol. Company became Vertol Division of the Boeing Company on 31 March 1960, later known as Boeing Vertol Company.

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