Title:
Helicopter device
United States Patent 2192881

Inventors:
Bothezat, George DE.
Publication Date:
03/12/1940
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Assignee:
HELICOPTER CORP OF AMERICA
Primary Class:
244/4A
Other Classes:
416/129, 244/17.230, 244/17.190, 244/100R, 123/41.560
International Classes:
B64C27/10; B64C27/00