Electrical apparatus used for switching electrical circuits

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then be to develop an electrical recording process that involved microphones and electrical disk cutting which did not produce a good enough sound quality. but by mid- , maxfield's group produced an experimental prototype system for electrical disc recording using wente's condenser microphone and arnold's

caughlin for providing mate- rial from the at&t archives used in writing this article. the author also thanks don barnickel for providing information for this article. r e f e r e n c e s hochheiser, sheldon, what makes the picture talk: at&t and the development of sound motion picture technology, ieee...

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, protection and control equipment and one or more transformers. in a large substation, circuit breakers are used to interrupt any short-circuits or overload currents that may occur on the network. smaller distribution stations may use recloser circuit breakers or fuses for protection of distribution

and requirements for the interconnection of distributed resources within the distribution system of epcor distribution & transmission inc... . power transformer – testing procedures [excel spreadsheet] this ms excel spreadsheet is actually detailed instruction for each procedure necessary for correct...

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"phone" redirects here. for other uses, see phone (disambiguation) . for the handheld personal computer, see smartphone . this article needs additional citations for verification . please help improve this article by adding citations to reliable sources . unsourced material may be challenged and removed

what he called "speaking tubes", but would now be called giant megaphones . [ ] a communication device for sailing vessels called a "telephone" was invented by the captain john taylor in . this instrument used four air horns to communicate with vessels in foggy weather. [ ] [ ] johann philipp reis used...

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

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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...

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