Drilldown: Patents

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Patents > Year filed: 1900 - 1999 & Patent agent: None & National tech categories: DK 77

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airplane (21) · Design (13) · stability (11) · frame (11) · wings (10) · lift (7) · Construction (7) · subsystem (6) · LTA (6) · propellers (4) · navigation (4) · Propulsion (4) · control (4) · Aerodynamics (3) · Steering (3) · Flapping (3) · balloon (3) · whole (3) · Airship (3)
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