Drilldown: Patents

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Patents > Publication date: 1920 & Number of claims: 4-90

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airplane (16) · construction (11) · frame (11) · Design (8) · None (6) · wings (6) · Propellers (4) · biplane (4) · metal (3) · landing (3) · Airship (3) · stability (3) · motors (3) · military (3)
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