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Vickers Tank Periscope MK.IV
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== References == {{Reflist}} * {{cite book |first1=Grzegorz |last1=Łukomski |first2=Rafał E. |last2=Stolarski |title=Nie tylko Enigma... Mjr Rudolf Gundlach (1892–1957) i jego wynalazek |trans-title=Not Only Enigma... Major Rudolf Gundlach (1892–1957) and His Invention |year=1999 |location=Warsaw-London |lang=pl |isbn=}} * [http://www.freepatentsonline.com/2130006.pdf 1938 US patent 2130006 "periscope for armored vehicles"] [[Category:Armoured fighting vehicle vision and sighting equipment]] [[Category:History of the tank]] [[Category:Military equipment of Poland]] [[Category:Polish inventions]]
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