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" ... UNITED KINGDOM - JANUARY 22: First caesium atomic clock, 1955. First caesium atomic clock, 1955. ... [+] Made by National Physical Laboratory (NPL), Teddington, Middlesex. The United States Bureau of Standards built an atomic-type clock using ammonia in 1948-49, but it was unsuccessful because, though it worked, it was no more accurate than a simple quartz clock. (Photo by Science & Society Picture Library/SSPL/Getty Images) ... "