atomichron

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Atomichron — The Atomichron was the worlds first commercial atomic clock, built by the National Company, Inc of Malden, Massachusetts. It was also the first self contained portable atomic clock and was a caesium standard clock. More than 50 clocks with the… … Wikipedia
Atomic clock — Nuclear clock redirects here. For the clock as a measure for risk of catastrophic destruction, see Doomsday Clock. For a clock updated by radio signals (commonly but inaccurately called an atomic clock ), see Radio clock. For the album by Zion I … Wikipedia
National Radio Company — The National Radio Company, headquartered in Malden, Massachusetts, USA was an American manufacturer of radio equipment from 1914 to 1991. Contents 1 History 2 See also 3 References 4 External links … Wikipedia
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