Drilldown: Patents
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Patents > Inventor country
:
CH
or
RU
& Grant date:
1800 - 1899
& National tech categories
:
AT 77d
or
FR 6.3
or
GB 4 propel & steer
or
USPC 244/3.23
or
None
& Number of text pages:
1-2 ![](/aero/extensions/Cargo/drilldown/resources/filter-x.png)
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