Drilldown: Patents
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Patents > Full specification filed date:
July 1911
& National tech categories
:
FR 6.4
or
USPC 244/3.23
or
None
& CPCs:
CPC Y02T50/166
& Family year:
1911
& Number of text pages:
3-4 ![](/aero/extensions/Cargo/drilldown/resources/filter-x.png)
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