Drilldown: Patents
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Patents > National tech categories
:
DE 77h
or
USPC 244/30
& Family year:
1900 - 1909
& Number of diagram pages:
2-8 ![](/aero/extensions/Cargo/drilldown/resources/filter-x.png)
![](/aero/extensions/Cargo/drilldown/resources/filter-x.png)
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![](/aero/extensions/Cargo/drilldown/resources/filter-x.png)
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Showing below up to 10 results in range #1 to #10.