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PCE
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DIFF Subgroup
G08B 17/103

using a light emitting and receiving device

Introduced: January 1990

Full Title

Fire alarms; Alarms responsive to explosion > Actuation by presence of smoke or gases > using a light emitting and receiving device

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

IPC defines codes here since 1990.

Child Classifications

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  • G08B 17/107 for detecting light-scattering due to smoke since 1990 IPC+CPC Available in IPC and CPC