Drilldown: Patents

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Patents > Year granted: 1900 - 1909 & IPCs : IPC B64B1/62 or IPC B64C27/04 & Number of text pages: 2-3

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helicopter (12) · propellers (9) · propulsion (6) · airplane (6) · ascension (5) · LTA (5) · None (4) · design (3) · safety (3) · Lift (3) · hybrid (3) · descent (2) · Aerodynamics (2) · wheels (2) · stability (2) · Aerostat (2) · parachutes (2) · Navigation (2) · wings (2)
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