The International Price Program (IPP) produces Import/Export Price Indexes (MXP) containing data on changes in the prices of nonmilitary goods and services traded between the U.S. and the rest of the world.
Heinrich Focke at Focke-Wulf was licensed to produce the Cierva C.30 autogyro in 1933. Focke designed the world's first practical transverse twin-rotor helicopter, the Focke-Wulf Fw 61, which first flew on 26 June 1936.
English language nicknames for helicopter include chopper, copter, helo, heli, and whirlybird. Helicopters were developed and built during the first half-century of flight, with the Focke-Wulf Fw 61 being the first operational helicopter in 1936.