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PCE
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DIFF Subgroup
G04C 21/12

by electro-acoustic means

Introduced: September 1968

Full Title

Producing acoustic time signals by electrical means > Indicating the time of the day > by electro-acoustic means

IPC and CPC are identically structured here. All 1 subcodes exist in both systems.

Child Classifications

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  • G04C 21/14 Electro-acoustic time announcement, i.e. spoken IPC+CPC Available in IPC and CPC