Formed March 1956 by renaming Piasecki Helicopter Corp.; no changes except in management, notably Frank Piasecki being replaced by Don R. Berlin (former chief engineer Northrop, Curtiss, Fisher and McDonnell). While in full production with H-21 and H-25/HUP, produced Model 107 (22 April 1958) reading to CH-46 Sea Knight and other versions, and Model 114 (flown as YCH-1B28 April 1961) leading to CH-47 Chinook. Entire stock purchased by Boeing effective 31 March 1960, Vertol becoming Boeing Vertol Co. and now Boeing Helicopters Division.

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