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Date: 2012-09-18 08:52:07Leap second Universal Time ITU-R Radio Regulations CCIR Atomic clock Day Measurement Time scales Coordinated Universal Time | UNITED STATES OF AMERICA DRAFT PRELIMINARY VIEWS FOR WRC-15Add to Reading ListSource URL: www.ntia.doc.govDownload Document from Source WebsiteFile Size: 29,00 KBShare Document on Facebook |