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Patents > Inventor country: US & Citations from after 1930: 5-30 & Number of text pages: 1-2

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Tech fields:
military (10) · projectile (10) · propeller (7) · None (6) · safety (4) · kite (4) · propulsion (2) · construction (2) · stability (2) · marine propulsion (2) · track (2) · fun (2) · ballistics (2) · LTA (2) · hand tools (2)
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None (22) · USPC 244/3.23 (7) · USPC 244/153R (3) · USPC 244/3.3 (3) · USPC 244/155R (2) · USPC 244/3.27 (2)
CPCs:
CPC B64C11/48 (5) · CPC F42B10/30 (4) · CPC B63H1/12 (3) · CPC F16B2/02 (2) · CPC B64C11/04 (2) · CPC B64C27/82 (2) · CPC B64C1/1476 (2) · CPC Y10T403/4677 (2) · CPC B63H5/10 (2) · CPC F16B2200/40 (2) · CPC A63H27/08 (2)
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