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Patents > Year granted: 1920 & National tech categories: FR 6.4 & Number of text pages: 1-2

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airplane (15) · Frame (8) · Design (8) · construction (6) · subsystem (6) · Control (5) · LTA (4) · propellers (4) · HTA (3) · propulsion (3) · aerodynamics (3) · Fuselage (3) · motors (3) · wings (3) · Airship (3)
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CPC B64C13/00 (3) · CPC B64C3/00 (3) · CPC B64B1/40 (2) · CPC B64B1/62 (2) · CPC B64C11/00 (2) · CPC B64C13/12 (2)
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