Drilldown: Patents
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- Techtypes (2376)
Patents > Year filed:
1910 - 1919
& Year granted:
1920
& Granted:
Yes
& CPCs
:
CPC B64B1/40
or
CPC B64B1/58
or
CPC B64C39/00
& Number of diagram pages:
1-2 ![](/aero/extensions/Cargo/drilldown/resources/filter-x.png)
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Showing below up to 10 results in range #1 to #10.