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Patents > Patent agent : Chappell & Earl or None & Number of figures: 9-13

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Airplane (8) · construction (7) · stability (7) · frame (7) · wings (6) · metal (6) · design (5) · None (5) · propulsion (4) · parachutes (3) · instrument (3) · biplane (3) · control (3) · toy (3) · navigation (3) · ornithopter (3)
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