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Patents > Filing date: 1912 & Number of figures: 10-11

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stability (6) · None (5) · design (5) · airplane (5) · Propellers (5) · Propulsion (4) · helicopter (4) · wings (4) · Construction (2) · sustentation (2) · control (2) · lift (2) · Safety (2) · navigation (2) · HTA (2) · military (2) · texture (2) · electric (2)
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CPC B64C17/00 (3) · CPC B64C3/00 (3) · CPC B64C2700/6218 (3) · CPC B64C2700/6295 (2) · CPC B64C39/00 (2) · CPC B64C1/26 (2) · CPC B64C2025/325 (2) · CPC B64C3/385 (2)
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