You can buy them...I've seen them advertised in aviation mags. Only a few thousand USD.
Note that I am not talking about the "atomic clocks" usually advertised, which are "atomic" only in that they are synchronized via radio to one of the NIST's radio stations (WWUV, say), but the Real Thing. I'm at work so I'm not going to google AAAS or AIP to find them...
emc
" When in doubt, use brute force." — Ken Thompson
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