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The Atomichron was the world's 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 trademarked Atomichron name were produced.[1][2][3][4]
References

Forman, P (July 1985). "Atomichron: The atomic clock from concept to commercial product". Proceedings of the IEEE. 73 (7): 1181–1204. doi:10.1109/PROC.1985.13266. ISSN 0018-9219. Archived from the original on 2007-10-21.
"The Global Positioning System". Archived from the original (pdf) on 2010-05-20. Retrieved 2008-04-23.
"Science Update". The Dallas Morning News. 1989-10-02.

The Global Positioning System: The Path from Research to Human Benefit. National Academy of Sciences. 1996. p. 7.

See also

Bluetooth low energy
Chip-scale atomic clock
Hoptroff London

External links

A Brief History of the National Company, Inc
Atomichron: The Atomic Clock from Concept to Commercial Product

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