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==Physics package realizations==
There exists a number of methods of utilizing the hyperfine splitting. These methods have their benefits and draw-backs and have influenced the development of commercial devices and laboratory standards. By tradition the hardware which is used to probe the atoms is called the physics package.
[[File:HP 5061A Cesium Beam Frequency Standard.JPG|thumb|right|One of the actual Hewlett Packard HP5061A cesium beam atomic clock units used in the "flying clock" experiment in 1965 to prove relativity theory.]]
===Atomic beam standard===
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