with provision for a number of operations at different times, e.g. ringing the bells in a school

Introduced: September 1968

Last revised: January 2006

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

Classification Context

Section:: PHYSICS
Class:: HOROLOGY
Subclass:: ELECTROMECHANICAL CLOCKS OR WATCHES

1 direct subcode

Child Classifications

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G04C 21/32 giving indications at a number of places, each at a different time, e.g. system of alarms in a hotel