Drilldown: Patents
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Patents > Office
:
BE
or
CA
or
LU
or
SU
or
UN
& Grant date:
August 7, 1923
& Supplementary to patent
:
Patent GB-1909-12556
or
Patent GB-1909-8531
or
None
& IPCs:
IPC B64C9/00 ![](/aero/extensions/Cargo/drilldown/resources/filter-x.png)
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Showing below up to 1 result in range #1 to #1.