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Patents > Office : CH or ES or GR or MX & Inventor country: US

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None (8) · propellers (7) · airplane (7) · airship (6) · stability (6) · LTA (6) · design (5) · wings (5) · wheels (4) · frame (4) · military (4) · propulsion (4) · safety (3) · parachute (3) · human-powered (3) · navigation (3)
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