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Date: 2011-07-06 03:32:51Time scales Clocks National Institute of Standards and Technology Time in the United States Mainflingen DCF77 Radio clock Atomic clock WWVB Measurement Technology Horology | Special Topic 50 years of time dissemination with DCF77Add to Reading ListSource URL: www.ptb.deDownload Document from Source WebsiteFile Size: 1,69 MBShare Document on Facebook |