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Patents > Patent agent : H. S. Hill or Herbert Haddan & Co. & Number of text pages: 3-11

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navigation (9) · airplane (8) · stability (8) · frame (8) · control (8) · None (5) · propellers (5) · LTA (5) · rudder (4) · balloon (4) · design (4) · construction (3) · Whole (3) · propulsion (3) · wings (3) · car (3)
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