Drilldown: Patents

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Patents > Inventor country: DE & Grant date: 1920 & Number of claims: 2-5

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frame (15) · airplane (12) · construction (12) · design (6) · biplane (5) · wings (5) · chassis (5) · suspension (3) · lift (3) · propeller (3) · military (3) · airship (3) · aerodynamics (3)
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