Drilldown: Patents
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Patents > Office
:
CH
or
GB
or
SE
or
UN
& Inventor country
:
BE
or
None
& Grant date:
1920 - 1929
& CPCs
:
CPC B64C13/00
or
CPC B64C2700/6274
or
CPC B64C3/385 ![](/aero/extensions/Cargo/drilldown/resources/filter-x.png)
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![](/aero/extensions/Cargo/drilldown/resources/filter-x.png)
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Showing below up to 2 results in range #1 to #2.