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| Keywords: Petr Bekhterev patent on parachute.jpeg en Petr Bekhterev patent on parachute http //samara rgantd ru/external/rgantd dev webzavod ru/photos/c_128/578 gif Petr Bekhterev 1927 PD-old PD-RU-exempt Insignia Parachuting in art IP protection documents in USSR | ||||
