CPC Subgroup
G04C 21/20 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
4 direct subcodes
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