Deutsch: Gedenkstein mit Infotafel für die in Köppern mit ihrem Deutschen Flugtechnischen Institut ansässig gewesenen Flugpioniere Bruno und Tony Werntgen
English: Memorial for flight pioneers Tony and Bruno Werntgen who had their German flight-technical institute in Friedrichsdorf-Köppern
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{{User:MdE/FotoCC-DE |InfoDE=Gedenkstein mit Infotafel für die in {{wd|Köppern}} mit ihrem ''Deutschen Flugtechnischen Institut'' ansässig gewesenen Flugpioniere {{wd|Bruno Werntgen|Bruno}} und {{wd|Tony Werntgen}} |InfoEN=Memorial for flight pionee...