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Patents > Year granted: 1920 & Number of figures: 4

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None (14) · airplane (8) · construction (5) · wings (5) · propellers (5) · design (5) · aerodynamics (3) · stability (2) · military (2) · marine (2) · lift (2) · aerial propeller (2) · frame (2) · landing (2) · aiming (2) · blades (2)
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