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.
During the years 1900, 1901, and 1902, Orville and Wilbur experimented at Kitty Hawk with kites, gliders, and a wind tunnel they built to test wing design. The Wright brothers developed the first effective airplane, and made the historic first airplane flight in 1903.