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Patents > Inventor country: NL & Number of diagram pages: 1

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frame (6) · airplane (5) · LTA (5) · subsystem (4) · airfoil (3) · balloon (3) · propulsion (3) · aerodynamics (3) · None (2) · sail (2) · propellers (2) · propeller (2) · instrument (2) · helicopter (2) · wings (2) · car (2)
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