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Topic    Prof. Rüdiger Gröning    
In some patent text: ?  Ruediger Dr Groening, GROENING, RUEDIGER,DR,

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April 16, 2020, post by Joe Faust
Explore also (not his):  HERE   regarding
  • DE7017582U • 1971-06-09 • SEEFLUTH UWE C [DE]
  • DE7513285U • 1975-12-04
  • Helicopter kite   US2472290A • 1949-06-07
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