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Patents > Year filed: 1912 & Inventor country : CH or US

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Tech fields:
None (156) · airplane (38) · stability (28) · propeller (15) · navigation (14) · frame (14) · LTA (13) · control (12) · wings (12) · propulsion (11) · design (10) · rudder (10) · construction (9) · whole (9) · helicopter (8) · propellers (8)
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Patent agent:
None (175) · Victor J. Evans (10) · G. H. Strong (5) · Marks & Clerk (4) · Brandon frères (4) · C. A. Snow & Co. (4) · J. S. Withers & Spooner (4) · P. R. J. Willis (3) · G. Petiau (3) · Munn & Co. (3)
National tech categories:
None (93) · FR 6.4 (26) · USPC 244/80 (12) · USPC 244/233 (10) · USPC 244/45R (9) · USPC 244/48 (8) · USPC 244/100R (7) · USPC 244/119 (6) · USPC 244/93 (6) · USPC 244/87 (6) · USPC 244/22 (5) · USPC 244/90R (5) · USPC 244/13 (5) · USPC 244/139 (5) · USPC 244/35R (5) · USPC 244/78.1 (4) · USPC 244/92 (4) · USPC 244/91 (4) · USPC 244/104R (4)
IPCs:
None (225) · IPC B64C39/00 (12) · IPC B64C3/38 (9) · IPC B64C17/00 (8) · IPC B64C3/00 (5) · IPC B64C1/00 (4) · IPC B64C23/00 (4) · IPC B64C9/00 (3) · IPC B64C13/00 (3) · IPC B64C27/04 (3) · IPC B64C25/00 (2) · IPC G01P3/36 (2) · IPC B64C11/16 (2) · IPC B64B1/58 (2) · IPC B64B1/00 (2) · IPC B63H1/26 (2) · IPC B64C33/00 (2) · IPC CPC B64C13/00 (2) · IPC B64C5/04 (2)
CPCs:
CPC B64C2700/6295 (36) · CPC B64C17/00 (30) · CPC B64C13/00 (29) · None (17) · CPC B64C3/385 (15) · CPC B64C23/005 (14) · CPC B64C39/00 (13) · CPC B64B1/00 (10) · CPC B64C3/00 (10) · CPC B64C33/02 (8) · CPC B64C39/08 (7) · CPC B64C3/14 (6) · CPC B64C1/26 (6) · CPC B64C11/006 (5) · CPC B64C13/24 (5) · CPC B64C2700/6274 (4) · CPC B64C25/60 (4)
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Citations from after 1930:
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