by closing a contact to ring an electromechanical alarm

Full Title

Producing acoustic time signals by electrical means > producing the signals at adjustable fixed times > by closing a contact to ring an electromechanical alarm

Classification Context

Section:

PHYSICS

Class:

HOROLOGY

Subclass:

ELECTROMECHANICAL CLOCKS OR WATCHES

Child Classifications

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• G04C 21/22 put into action by the arbor of a mechanical alarm work
• G04C 21/24 put into action by the spring of a mechanical alarm work
• G04C 21/26 put into action by the vibrations caused by the operation of a mechanical alarm work