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Patents > CPCs : CPC B64C23/005 or CPC B64C27/82 & First filing: Yes

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None (270) · Seine (4) · Chicago (3) · Aisne (3) · New York (3) · Indiana (3) · California (3) · Maine-et-Loire (2) · New York county (2) · London (2) · Nord (2) · Gironde (2) · Paris (2) · Minnesota (2) · Pennsylvania (2) · Birmingham (2) · the Bronx (2) · Villers-Cotterêts (2)
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None (137) · airplane (73) · propulsion (62) · helicopter (57) · frame (44) · propeller (44) · navigation (44) · hybrid (41) · stability (27) · ascension (17) · design (17) · propellers (16) · LTA (16) · landing (13) · rudder (12) · lift (12) · Takeoff (12) · whole (12) · wings (12) · HTA (11)
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None (94) · None (21) · Victor J. Evans (15) · Munn & Co. (11) · W. P. Thompson & Co. (6) · Armengaud jeune (4) · J. Bonnet-Thirion (4) · C. Bauman (3) · C. A. Snow & Co. (3) · Chassevent (3) · Paul Caquet (3) · Joshua R. H. Potts (3) · J. Germain (3) · E. Bletry (3) · A. M. Wilson (3) · Frank T. Wentworth (3)
National tech categories:
None (100) · FR 6.4 (81) · USPC 244/6 (45) · USPC 244/66 (24) · USPC 244/12.1 (13) · USPC 244/17.21 (9) · USPC 244/17.19 (9) · USPC 244/80 (7) · USPC 244/65 (6) · USPC 244/60 (6) · USPC 244/139 (6) · USPC 244/100R (5) · USPC 244/35R (5) · DE 77 (4) · USPC 244/17.11 (4) · USPC 244/48 (4) · USPC 416/123 (4)
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