Patent Model - Improvement in Relays for Telegraphic Instruments
Maker and role
Edward Hidden, Patentee
Feb 15 1870
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Brass, lead, wood
10 1/4 x 9 x 6" (26 x 22.9 x 15.2cm)
Edward Hidden’s patent was for “new and useful Improvements in Relays, as they're sometime termed, being instruments which break and make electro-magnetic circuits, when another electro-magnetic circuit is broken or closed.” (Patent #99,892)
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