giving indications at a number of places, each at a different time, e.g. system of alarms in a hotel

Full Title

Producing acoustic time signals by electrical means > producing the signals at adjustable fixed times > with provision for a number of operations at different times, e.g. ringing the bells in a school > giving indications at a number of places, each at a different time, e.g. system of alarms in a hotel

Classification Context

Section:

PHYSICS

Class:

HOROLOGY

Subclass:

ELECTROMECHANICAL CLOCKS OR WATCHES