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Patents > Inventor country: US & Citations from after 1930: 2 & Number of text pages: 1-2

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None (10) · LTA (7) · propeller (6) · military (5) · projectile (4) · airplane (4) · propulsion (4) · parachute (3) · navigation (3) · balloon (3) · marine (3) · frame (3) · kite (3) · stability (3) · helicopter (2) · cargo (2) · Windmill (2) · paddle-wheel (2)
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None (19) · USPC 244/3.23 (4) · USPC 244/153R (2) · USPC 244/66 (2)
CPCs:
CPC B64C27/54 (5) · CPC Y02E10/20 (3) · CPC B64C13/00 (3) · CPC B64C11/48 (3) · CPC B64C23/005 (3) · CPC F42B10/30 (2) · CPC A63H27/08 (2) · CPC F03D3/00 (2) · CPC B63H5/10 (2) · CPC B64C29/0033 (2) · CPC B64B1/40 (2) · CPC Y02E10/74 (2) · CPC B64C11/006 (2)
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