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PCE
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DIFF Subgroup
G04C 21/20

by closing a contact to ring an electromechanical alarm

Introduced: September 1968

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

Of 4 combined children, 3 exist in both systems.

1 codes are CPC-only extensions.

Child Classifications

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  • G04C 21/205 CPC only CPC only
  • G04C 21/22 put into action by the arbor of a mechanical alarm work IPC+CPC Available in IPC and CPC
  • G04C 21/24 put into action by the spring of a mechanical alarm work IPC+CPC Available in IPC and CPC
  • G04C 21/26 put into action by the vibrations caused by the operation of a mechanical alarm work IPC+CPC Available in IPC and CPC