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Research and Experimental Aircraft
Research and Experimental Aircraft 
Rotorcraft
Rotorcraft 
Orphan albums - Virtual folders
Orphan albums - Virtual folders 
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Conceptually similar
XH-17 "Flying Crane"
XH-17 "Flying Crane" 
XH-17 Flying Crane
XH-17 Flying Crane 
X-20 Dyna-Soar
X-20 Dyna-Soar 
H-6U Unmanned Little Bird (ULB)
H-6U Unmanned Little Bird (ULB) 
DB-7/A-20 Boston/Havoc
DB-7/A-20 Boston/Havoc 
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XH-20 Little Henry

The McDonnell XH-20 Little Henry was the world's first ramjet helicopter. 
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Unique identifier BI4ALB328 
Type Album