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Patents > Year filed: 1910 & Office: BE & National tech categories: BE K & Number of figures: None

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airplane (23) · propellers (15) · hybrid (11) · LTA (10) · wings (5) · stability (5) · navigation (3) · dirigible (3) · design (3) · subsystem (3) · steering (2) · propulsion (2) · automatic stability (2) · frame (2) · parachute (2) · nervure (2) · winglets (2)
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