Drilldown: Patents
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Patents > Inventor country
:
BE
or
FR
& Grant date:
1920
& IPCs
:
IPC B64C11/00
or
IPC B64C17/00
or
IPC B64C39/00 ![](/aero/extensions/Cargo/drilldown/resources/filter-x.png)
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![](/aero/extensions/Cargo/drilldown/resources/filter-x.png)
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