Drilldown: Patents
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Patents > Office
:
DE
or
FR
& National tech categories
:
DE 77h.5
or
FR 6.4
or
IT 8
& IPCs
:
IPC B64C3/00
or
IPC B64C3/38
& Family year:
1912
& Number of text pages:
3 ![](/aero/extensions/Cargo/drilldown/resources/filter-x.png)
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