Drilldown: Patents
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- Patents (17613)
- Person (2134)
- Publications (24568)
- Techtypes (2381)
Patents > Year filed:
1917
& Office
:
ES
or
NL
or
Other
& Publication date:
1900 - 1999
& National tech categories
:
DE 77h.5
or
GB 4 propel & steer
& CPCs
:
CPC B64C2700/6235
or
CPC B64C3/00
& First filing:
No ![](/aero/extensions/Cargo/drilldown/resources/filter-x.png)
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![](/aero/extensions/Cargo/drilldown/resources/filter-x.png)
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Use the filters below to narrow your results.
Showing below up to 3 results in range #1 to #3.