Electrical apparatus used for protecting electrical circuits

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switching circuits. [ ] eventually, vacuum tubes replaced relays for logic operations. lee de forest 's modification, in , of the fleming valve can be used as an and gate . ludwig wittgenstein introduced a version of the -row truth table as proposition of tractatus logico-philosophicus ( ). walther

bothe , inventor of the coincidence circuit , shared the nobel prize in physics, for the first modern electronic and gate in . mechanical analog computers started appearing in the first century and were later used in the medieval era for astronomical calculations. in world war ii , mechanical analog...

https://en.wikipedia.org/wiki/Digital_electronics

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us coating apparatus patents and patent applications (class ) - justia patents search log in sign up find a lawyer ask a lawyer research the law law schools laws & regs newsletters legal marketing law firm websites law firm seo lawyer directory local marketing other marketing solutions justia patents

coating apparatus patents (class ) coating apparatus patents (class ) control means responsive to a randomly occurring sensed condition (class / ) sampling of associated base (class / ) condition of coated material (class / ) temperature responsive (class / ) responsive to attribute, absence or presence...

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of the telegraph line. in gray received a patent for the invention, the first of more than seventy. in , elisha gray and his partner enos m. barton founded gray & barton co. in cleveland, ohio to supply telegraph equipment to the giant western union telegraph company . the electrical distribution business

company of chicago . gray continued to invent for western electric. in , gray retired to do independent research and development. gray applied for a patent on a harmonic telegraph which consisted of multi-tone transmitters, that controlled each tone with a separate telegraph key. gray gave several private...

https://en.wikipedia.org/wiki/Elisha_Gray

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