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Patents > Inventor country : HU or NL & Number of diagram pages: 2-4

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airplane (15) · stability (13) · automatic stability (9) · design (7) · navigation (5) · lift (5) · propellers (4) · propulsion (4) · LTA (4) · steering (4) · frame (4) · wings (3) · dirigibles (3) · airship (3) · whole (3) · airfoil (3) · equilibrium (3) · Flapping (3)
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