Drilldown: Patents
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Patents > Office
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& Filing date:
1913
& Publication date:
1930
& National tech categories
:
GB 4 propel & steer
or
HU V/h
or
USPC 244/30
& Number of figures:
4-6 ![](/aero/extensions/Cargo/drilldown/resources/filter-x.png)
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Showing below up to 1 result in range #1 to #1.