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Yuri Kondratyuk
Yuri Vasilievich Kondratyuk (June 21 1897 - 1942) was the pseudonym adopted by Oleksandr Ignatyevich Shargei, a pioneer of astronautics and spaceflight of Swedish descent. He was a theoretician and a visionary who, in the early twentieth century, foresaw ways of reaching the moon.
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