Drilldown: Patents
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Patents > Grant date:
1840 - 1849
& National tech categories:
USPC 40/90
& CPCs :
CPC B63H1/04 or
CPC B64B1/00 or
CPC B64C3/385
& Family year:
1800 - 1899
& First filing:
Yes
& Number of text pages:
2
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Showing below up to 1 result in range #1 to #1.