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Patents > Year granted: 1915 & Inventor country : BE or DE

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airplane (18) · frame (11) · wings (10) · None (9) · design (6) · construction (6) · stability (5) · biplane (5) · propulsion (5) · subsystem (5) · LTA (4) · hybrid (4) · Texture (4) · lift (3) · hydroaeroplane (3) · airfoil (3) · flapping (3) · marine (3) · Fabric (3)
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