Drilldown: Patents
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Patents > Office
:
BE
or
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or
GB
or
RU
& Family year:
1890 - 1899
& Citations from after 1930:
2
& Number of claims:
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.