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Patents > Year granted: 1920 & Number of text pages: 5-10

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airplane (11) · None (6) · propellers (4) · construction (4) · stability (3) · propulsion (3) · navigation (3) · LTA (3) · flotation (2) · strut (2) · steering (2) · propeller (2) · motors (2) · aerial propellers (2) · fuselage (2) · frame (2) · wings (2) · control (2) · design (2)
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