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Patents > Inventor country: BE & Number of text pages: 1-2

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airplane (12) · propulsion (9) · LTA (8) · wings (7) · design (7) · stability (6) · hybrid (6) · propellers (6) · frame (5) · helicopter (5) · aerodynamics (4) · construction (4) · lift (4) · flapping (4) · sustentation (4)
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