Drilldown: Patents
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Patents > Office
:
FR
or
UN
& Filing date:
1908
& National tech categories
:
DE 77h
or
FR 6.4
& IPCs
:
IPC B64C23/00
or
None
& Number of text pages:
1-2
& Number of diagram pages:
1-2 ![](/aero/extensions/Cargo/drilldown/resources/filter-x.png)
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