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Patents > Office : CH or HU & Number of text pages: 5

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Airplane (16) · Design (9) · stability (6) · frame (6) · whole (5) · Automatic stability (4) · propulsion (4) · propellers (4) · navigation (4) · motors (4) · Aerodynamics (3) · propeller (3) · lift (3) · wings (3) · biplane (3) · control (3) · Construction (3)
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