Drilldown: Patents
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Patents > Office:
FR
& Filing date:
1914
& Publication date:
April 1915
& National tech categories
:
FR 6.2
or
FR 6.3
or
FR 6.4
& IPCs:
IPC B64C35/00
& CPCs
:
CPC B64C2700/6235
or
CPC B64C35/00 ![](/aero/extensions/Cargo/drilldown/resources/filter-x.png)
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