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Improvement in circuit-changers for electro-magnetic telegraph
Charles Buckley
1851-09-02
US 0008340 A
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Improvement in means for obviating difficulties arising from defective insulation in telegraphs
Charles Buckley
1851-08-26
US 0008321 A
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Improvement in electro-magnetic annunciators for signals in hotels, &c.
Charles Buckley
1850-10-29
US 0007739 A