Drilldown: Patents

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Patents > Year granted: 1909 & National tech categories : AT 77d or MX F. III

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LTA (11) · airplane (7) · balloon (5) · Frame (5) · None (4) · navigation (4) · Wings (4) · hybrid (3) · Airship (3) · Design (3) · Gas (3) · Drachenflieger (3)
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