Drilldown: Patents
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Patents > Year granted:
1880 - 1889
& Office:
DE
& Inventor country:
None
& National tech categories
:
USPC 244/30
or
None ![](/aero/extensions/Cargo/drilldown/resources/filter-x.png)
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![](/aero/extensions/Cargo/drilldown/resources/filter-x.png)
![](/aero/extensions/Cargo/drilldown/resources/filter-x.png)
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Showing below up to 9 results in range #1 to #9.