Drilldown: Patents

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Patents > Year granted: 1920 - 1929 & First filing: No & Number of claims: 6-30

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airplane (12) · propellers (8) · design (6) · construction (5) · frame (5) · wings (3) · instrument (3) · motors (3) · helicopter (3) · propeller (3) · airfoil (3) · wing (3)
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