Drilldown: Patents
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Patents > Year granted:
1928
& Office
:
CA
or
GB
or
IT
& Inventor country
:
GB
or
NL
or
NO
& Filing date:
May 2, 1928
& National tech categories
:
FR 6.4
or
USPC 244/80 ![](/aero/extensions/Cargo/drilldown/resources/filter-x.png)
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