IPC Subgroup
G08B 21/22 responsive to presence or absence of persons
Introduced: January 2000
Last revised: January 2006
Full Title
Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for > Status alarms > responsive to presence or absence of persons
Classification Context
- Section:
- PHYSICS
- Class:
- SIGNALLING
- Subclass:
- SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS