atomic clock

atomic time

international atomic time

new on-board atomic clock

satellite atomic clock

clock time

real time clock

time clock

time clock detonator

summit time low tide time and flat time of electric usage

Atomic Trapping-Flame Atomic Spectrometry

actual time over standard time

corrected retention time corrected retention time

dead time delay time

delay time dead time

Mining Action of Non-Equipoise Time After Time

peace time changing war time

Real time PCR real time polymerase chain reaction

~(87)Rb atomic frequency standard

absolute atomic weight