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Spiegel.de: Schnurrender Zwitter - DER SPIEGEL
Ein Drehflügler mit einem Rotor ohne Motor - das »Autogiro«, schon früher als Postflieger genutzt, steht vor dem Comeback.
Gyroplane - Best Inventions of TIME
content.time.com
Inventor: Groen Bros. AviationIt's a plane ... It's a helicopter ... Actually, it's a bit of both. The gyroplane, whose concept was first put forward in
Groen Brothers Elects New Board Chairman | Aero-News Network
www.aero-news.net
David Groen Steps In After Brother's Passing Two weeks after Jay Groen, co-founder of Groen Brothers Aviation, Inc. passed away after a fight with ca|...
AIA Elects Officers, Board of Governors for 2009
www.spaceref.com
AIA Elects Officers, Board of Governors for SpaceRef
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