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Patents > Tech fields : Pendulum or propeller & IPCs: None

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Supplementary to patent:
None (498) · Patent GB-1909-12556 (9) · Patent DE-1899-123884 (5) · Patent US-1906-850616 (3) · Patent GB-1911-5162 (3) · Patent GB-1909-2111 (3) · Patent DE-1907-194165 (3) · Patent US-1894-526394 (3) · Patent DE-1894-76727 (3) · Patent FR-1904-340154 (3) · Patent DE-1893-73799 (3) · Patent AU-1911-510 (3) · Patent GB-1908-13809 (3)
Related to aircraft:
Patent agent:
None (332) · Munn & Co. (18) · Victor J. Evans (11) · Haseltine, Lake & Co. (8) · None (7) · Watson E. Coleman (6) · Michael J. Stark & Sons (4) · Abel & Imray (4) · Henry Hughes (4) · R. S. & A. B. Lacey (4) · Marks & Clerk (3) · W. D. Rowlingson (3) · E. Imer-Schneider (3) · Knight Bros. (3) · Arthur Otto Sachse (3) · H. C. Everett Co. (3) · Jensen & Son (3)
National tech categories:
None (187) · DE 77h.6 (23) · GB 4 propel & steer (21) · AT 77d (19) · IT 8 (18) · USPC 244/6 (13) · DE 77 (13) · FR 6.4 (11) · USPC 244/51 (10) · GB 4 with buoyant (10) · USPC 244/66 (9) · USPC 244/73R (9) · USPC 244/22 (8) · USPC 244/80 (8) · RU Group V (8) · GB 4 without buoyant (7) · BE K (7)
IPCs: (Click arrow to add another value)
CPCs:
None (297) · CPC B64B1/00 (35) · CPC B64C23/005 (29) · CPC B64C11/006 (23) · CPC B64C11/48 (16) · CPC B64C2700/6295 (15) · CPC B64C33/02 (14) · CPC B64C39/005 (13) · CPC B64C17/00 (12) · CPC B63H1/12 (10) · CPC B64C9/00 (9) · CPC B64C39/08 (9) · CPC B64C11/00 (8) · CPC B64C13/00 (7) · CPC B64C27/82 (7) · CPC B64C11/065 (7) · CPC B64C3/385 (6) · CPC B63H1/04 (6) · CPC B64C11/36 (6) · CPC B63H5/10 (6)
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Citations from after 1930:
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