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Patents > Citations from after 1930: 3-40 & Number of figures: 5

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Tech fields:
Propeller (7) · None (7) · military (5) · frame (4) · Windmill (3) · rudder (3) · propulsion (3) · kite (3) · helicopter (3) · safety (2) · aerial propellers (2) · landing (2) · marine propulsion (2) · airfoil (2)
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None (19) · USPC 244/153R (3) · USPC 244/200 (2)
CPCs:
CPC Y02E10/74 (4) · CPC A63H27/08 (3) · CPC B64C11/48 (3) · CPC F03D3/00 (3) · CPC B64C27/82 (2) · CPC B64C11/205 (2) · CPC B64C27/04 (2) · CPC B63H5/10 (2) · CPC B64C39/08 (2) · CPC F05B2260/72 (2) · CPC B64C2700/6295 (2)
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