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Patents > Inventor country: NL & Publication date: 1900 - 1999 & Citations from after 1930: None

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airplane (10) · subsystem (9) · frame (6) · LTA (5) · Aerodynamics (4) · propulsion (3) · airfoil (3) · sail (2) · propellers (2) · propeller (2) · Navigation (2) · military (2) · instrument (2) · Wings (2) · Construction (2) · balloon (2)
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