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Single-screw rapid helicopter
US 1,775,783 A
Filed
: 10/20/1927
Issued
: 09/16/1930
Est. Priority Date
: 10/22/1926
Status: Expired due to Term
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Current Assignee
Alfred Perrin Edouard
Original Assignee
Alfred Perrin Edouard
Inventors
ALFRED PERRIN EDOUARD
Application Number
US02/227,553
Time in Patent Office
1,062 Days
Field of Search
US Class Current
244/17.19
CPC Class Codes
B64C 27/28
with forward-propulsion pro...
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