frequency standard
type: Concept
preferred label: استاندارد بسامد @fa
related: atomic clock

measurement standard
type: Concept
preferred label: استاندارد اندازه‌گیری @fa
related: atomic clock

maser
type: Concept
preferred label: میزر @fa
related: atomic clock

frequency measurement
type: Concept
preferred label: اندازه‌گیری بسامد @fa
related: atomic clock

time measurement
type: Concept
preferred label: اندازه‌گیری زمان @fa
related: atomic clock

atomic clock
type: Concept
alternative label: maser clock
broader: clock
preferred label: ساعت اتمی @fa
related: frequency measurement
related: time measurement
related: frequency meter
related: maser
related: frequency standard
related: measurement standard

clock
type: Concept
narrower: atomic clock
preferred label: ساعت @fa

frequency meter
type: Concept
preferred label: بسامدسنج @fa
related: atomic clock