Yuri Vasilievich Kondratyuk

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Yuri Vasilievich Kondratyuk studied mathematics and physics at an early age and attended engineering school in St. Petersburg before World War I. He later joined Friedrich Tsander and Konstantin Tsiolkovsky to spread the idea of rocketry. He participated in engineering projects and discussed four-stage liquid-oxygen and hydrogen rockets and space elevators.

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National Air and Space Museum Archives, Smithsonian Institution

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