Drilldown: Patents
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Patents > Office
:
GB
or
MX
& Supplementary to patent
:
Patent BE-1909-214032
or
Patent HU-1901-24148
or
Patent NO-1915-12-15 Carl Alfred Johansson
or
None
& CPCs:
CPC B64C2700/6218
& Family year:
1909 ![](/aero/extensions/Cargo/drilldown/resources/filter-x.png)
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Frederick William Dufwa (2) ·
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