Flying machine and more particularly helicopter
United States Patent 3013746

Inventors:
Siebenthal, Ciement DE.
Publication Date:
12/19/1961
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Assignee:
Siebenthal, Ciement DE.
Primary Class:
Other Classes:
416/99, 416/123
International Classes:
B64C27/04; B64C27/16; B64C27/00
US Patent References:
2659556Method of distributing insecticides or fungicides and steam jet-driven helicopter for performing same