Drilldown: Patents
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Patents > Grant date:
1920 - 1929
& National tech categories:
AT 77d
& IPCs
:
IPC B64C3/18
or
IPC B64C39/00
or
None ![](/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 8 results in range #1 to #8.