Drilldown: Patents
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Patents > Year granted:
1921
& Office
:
FR
or
GB
& Applicant firm:
None
& National tech categories
:
FR 6.4
or
USPC 244/3.23
& Number of text pages:
1-2 ![](/aero/extensions/Cargo/drilldown/resources/filter-x.png)
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IPC B64F2700/6226 (1)
Showing below up to 16 results in range #1 to #16.