Drilldown: Patents

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Patents > Year granted: 1890 - 1899 & Tech fields : compact or propeller

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Richard Czygan (4) · Edward Joel Pennington (3) · Hermann Ganswindt (2) · Carl Friedrich Billwiller (2) · Georg Gabrielii (2) · Hubbell Duane Hurlbut (2) · Stewart Cairncross (2)
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