US Number-Issued Patents (1836-1861, 1866-1920)
About the Collection
Collection preserves US number-issued patents (1836-1861, 1866-1920).
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Improvement in means for obviating difficulties arising from defective insulation in telegraphs
Charles Buckley
1851-08-26
8321
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Improvement in electro-magnetic annunciators for signals in hotels, &c.
Charles Buckley
1850-10-29
7739
