Drilldown: Patents

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Patents > Year granted: 1910 - 1919 & Office : DE or JP & Tech fields : airship or balloon or propeller or propellers

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None (12) · Hellmuth Hirth (3) · Christian Lorenzen (3) · Walter Hermann von Mach (2) · Johann Schütte (2) · Jakob Haw (2)
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Showing below up to 59 results in range #1 to #59.

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