Drilldown: Patents
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Patents > Filing date:
November 20, 1889
& Grant date:
1890
& National tech categories
:
DE 77h
or
USPC 244/48
& CPCs
:
CPC B64C17/00
or
CPC B64C3/385
& Number of figures:
2-4 ![](/aero/extensions/Cargo/drilldown/resources/filter-x.png)
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Showing below up to 1 result in range #1 to #1.