atomic clock
atomic clock is a clock or type of clock.
Overview
Catalogue entries for clocks state movement, case, dial signature and running condition. VALÉORINE records this subject so that lots referring to it can be described consistently.
In detail
extremely accurate reference clock used as a standard for timekeeping
Sources
Each source is named with the standing the house places on it, so the evidence can be weighed rather than taken on trust.
reference work · Reputable secondary · Wikipedia
“Atomic clock”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q227467: atomic clock
Consult the source