Drilldown: Patents

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Patents > Inventor country : ES or RU & Number of text pages: 3

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airplane (9) · LTA (8) · propulsion (7) · hybrid (6) · aerodynamics (5) · balloon (5) · frame (5) · wings (4) · helicopter (4) · flapping (3) · whole (3) · propellers (3) · landing (3) · None (3) · hydrodynamics (3)
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