Drilldown: Patents

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Patents > Office: DE & Inventor country : CA or DE & Grant date: 1920 - 1929

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Office: (Click arrow to add another value)
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Tech fields:
None (31) · frame (31) · airplane (29) · construction (21) · design (17) · wings (16) · biplane (8) · fuselage (8) · chassis (7) · control (7) · propellers (6) · metal (5) · aerodynamics (4) · subsystem (4) · rudder (4) · airfoil (3) · propeller (3) · LTA (3)
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None (21)
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CPCs:
CPC B64C3/00 (25) · CPC B64C2700/6235 (14) · CPC B64C2700/6233 (7) · CPC B64C35/00 (6) · CPC B64C13/00 (6) · CPC B64C9/02 (5) · CPC B64C25/62 (4) · CPC B64C2001/0081 (4) · CPC B64C11/20 (4) · CPC B64C17/00 (3) · CPC B64F2700/6226 (3) · CPC B64B1/58 (3) · CPC B64C3/56 (3) · CPC B64C3/185 (3) · CPC B64C11/00 (3)
First filing:
Cites these patents:
Citations from after 1930:
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