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https://en.wikipedia.org/wiki/Oboe_(navigation)
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https://en.wikipedia.org/wiki/Gee-H_(navigation)#Oboe
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https://www.qsl.net/pe1ngz/stories/story-oboe-h2s.html
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https://de.wikipedia.org/wiki/Egon_(Radar)
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http://www.gyges.dk/fightercontrol_stations 2.htm
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https://en.wikipedia.org/wiki/German_Luftwaffe_and_Kriegsmarine_Radar_Equipment_of_World_War_II
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https://en.wikipedia.org/wiki/Lichtenstein_radar
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https://en.wikipedia.org/wiki/FuG_224_Berlin_A
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https://lazarbibi.blog.hu/2017/02/18/az_elektronikus_navigacio_tortenete_4_resz
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https://en.wikipedia.org/wiki/LORAN
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