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Patents > Office: BE & National tech categories: BE K & Family year: 1912 & Number of figures: None

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airplane (18) · design (10) · propellers (7) · construction (7) · hybrid (7) · wings (6) · Sustentation (6) · stability (5) · Aerodynamics (4) · helicopter (4) · Lift (4) · Hydroplane (4) · propulsion (4) · ascension (4) · Equilibrium (3) · navigation (3) · control (3) · steering (3)
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