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Helicopter with counter-rotating propeller
US 2,996,269 A
Filed
: 04/12/1956
Issued
: 08/15/1961
Est. Priority Date
: 04/12/1956
Status: Expired due to Term
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Current Assignee
Robert D. Parry
Original Assignee
Robert D. Parry
Inventors
Parry, Robert D.
Application Number
US03/577,795
Time in Patent Office
1,951 Days
Field of Search
US Class Current
244/17.19
CPC Class Codes
B64C 27/12
Rotor drives
B64C 27/20
Rotorcraft characterised by...
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