Drilldown: Patents

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Patents > Year filed: 1900 - 1909 & Inventor country: DE & Number of claims: 7-15

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propulsion (6) · None (4) · airplane (4) · airship (4) · gas (4) · fabric (3) · safety (3) · propellers (3) · frame (3) · LTA (3) · ballonet (3)
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