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出典:『Wikipedia』 (2011/06/28 15:31 UTC 版)

英語による解説

引用

NIST-F1 is a cesium fountain clock or atomic clock in the National Institute of Standards and Technology (NIST) in Boulder, Colorado, and serves as the United States' primary time and frequency standard. The clock took less than four years to test and build, and was developed by Steve Jefferts and Dawn Meekhof of the Time and Frequency Division of NIST's Physical Measurement Laboratory.