Drilldown: Patents
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Patents > Year granted:
1880 - 1889
& Filing date:
1800 - 1899
& National tech categories:
USPC 415/121.3
& Number of text pages:
1-2
& Number of claims:
4-7
& Number of diagram pages:
0-20 ![](/aero/extensions/Cargo/drilldown/resources/filter-x.png)
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