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Patents > Year filed: 1913 & Office: HU & Number of diagram pages: 1-3

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Airplane (21) · stability (10) · Automatic stability (6) · Propellers (6) · Frame (5) · Propulsion (5) · design (5) · wings (4) · safety (4) · construction (4) · wheels (3) · motors (3) · Hangars (3) · aerodynamics (3) · landing (3) · control (3) · Equilibrium (3)
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