Audible signalling systems, e.g. audible personal calling systems

Introduced: September 1968

IPC and CPC are identically structured here. All 4 subcodes exist in both systems.

Child Classifications

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G08B 3/02 using only mechanical transmission IPC+CPC Available in IPC and CPC
G08B 3/06 using hydraulic transmission; using pneumatic transmission IPC+CPC Available in IPC and CPC
G08B 3/10 using electric transmission; using electromagnetic transmission +1 CPC IPC+CPC Available in IPC and CPC
G08B 3/14 using explosives IPC+CPC Available in IPC and CPC