Ridley Park, Pennsylvania is home of a Boeing division that produces a helicopter model developed by what company?
Ridley Park, Pennsylvania:  Ridley Park is the home of The Boeing Company's CH-47 Chinook helicopter division. Boeing CH-47 Chinook: The Boeing CH-47 Chinook is an American twin-engine, tandem-rotor, heavy-lift helicopter developed by American rotorcraft company Vertol and manufactured by Boeing Vertol (later known as Boeing Rotorcraft Systems).
Vertol