electric crystal clock

crystal clock

crystal crystal class

ferroelectric (=seignette-electric) crystal

pyro-electric crystal

quartz crystal clock

quartz-crystal clock

Seidel electric crystal

ae[o]lotropic crystal; crystal anisotropic; anisotropic crystal

controlled electric clock

controlling electric clock

desk type electric clock

desk type luminous electric clock

electric clock

electric clock device

electric clock synchronizer

secondary electric clock

electric furnace；electric hot plate；electric stove

crystal-controlled oscillator(=crystal oscillator)