Flying machine and more particularly helicopter
United States Patent 3013746
Inventors:
Siebenthal, Ciement DE.
Publication Date:
12/19/1961
Assignee:
Siebenthal, Ciement DE.
Other Classes:
416/99, 416/123
International Classes:
B64C27/04; B64C27/16; B64C27/00
US Patent References:
| 2659556 | Method of distributing insecticides or fungicides and steam jet-driven helicopter for performing same | | | |