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Description:00 07 11 00 History of the aviation. The 20s. Pioneers, inventions, prototypes, transport, communications. In August, 1929, the German dirigible balloon " Graf Zeppelin " makes the tour of the world in 20 days from Japan to Los Angeles, speed record. Seen on " Graf Zeppelin ". Prototype to Fokker F 32, the biggest plane in the United States before his accident, he crashed to Teterboror, New Jersey in 1929. Some too expensive, only copies were constructed. Takeoff of this plane. Close-up F 32 in sky. Los Angeles, Dycer Airport, demonstration of helicopter " Pitcairn Autogiro ", development between 1930 and 1931. Seen on ancestor of the helicopter, takeoff and landing, mixture of plane and helicopter. Big helixes above.