Drilldown: Patents
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Patents > Office
:
DE
or
HU
or
UN
& Filing date:
April 12, 1916
& National tech categories
:
DE 77h.6
or
HU V/h
& IPCs
:
IPC B64C11/02
or
IPC B64C25/00
or
IPC B64C3/54 ![](/aero/extensions/Cargo/drilldown/resources/filter-x.png)
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Showing below up to 1 result in range #1 to #1.