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https://en.wikipedia.org/wiki/Foxtrot-class_submarine
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https://de.wikipedia.org/wiki/Projekt_641
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https://hu.wikipedia.org/wiki/641-es_tervszámú_tengeralattjáró
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https://www.warhistoryonline.com/world-war-ii/reverse-engineering-b29-soviet-tu4.html
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https://b-29s-over-korea.com/shortstories/russianclone.htm
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http://авиару.рф/aviamuseum/aviatsiya/sssr/bombardirovshhiki-2/bombard-1920-e-1940-e-gody/dalnij-strategicheskij-bombardirovshhik-tu-4/
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http://www.dogswar.ru/voennaia-aviaciia/samolety/4434-dalnii-bombardirovsh.html
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http://www.tupolev.ru/en/aircrafts/68_(tu-4)
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https://ru.wikipedia.org/wiki/Ту-4
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https://www.public.navy.mil/subfor/underseawarfaremagazine/Issues/Archives/issue_25/sosus.htm
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