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Protective relay — See also: Power system protection In electrical engineering, a protective relay is a complex electromechanical apparatus, often with more than one coil, designed to calculate operating conditions on an electrical circuit and trip circuit breakers … Wikipedia
Clock — For other uses, see Clock (disambiguation). Timepiece redirects here. For the Kenny Rogers album, see Timepiece (album). Platform clock at King s Cross railway station, London … Wikipedia
UNIVAC Solid State — The UNIVAC Solid State was a 2 address, bi quinary coded decimal computer, with memory on a rotating drum with 5000 signed 10 digit words, spinning at 17,667 RPM in a helium atmosphere. It was announced by Sperry Rand in December 1958, as a… … Wikipedia
Alarm clock — Clock radio redirects here. For the clocks synchronised by radio signals, see Radio clock. Traditional wind up (keywound), mechanical, spring driven alarm clock … Wikipedia
Tram controls — The following article describes the controls on electric, rather than steam trams.OverviewThe operation of trams is relatively simple. As trams run on rails, they do not require steering controls. However they do require controls for the smooth… … Wikipedia

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