IPC Subgroup
G08B 17/04 Hydraulic or pneumatic actuation of the alarm, e.g. by change of fluid pressure
Introduced: September 1968
Last revised: January 2006
Full Title
Fire alarms; Alarms responsive to explosion > Hydraulic or pneumatic actuation of the alarm, e.g. by change of fluid pressure
Classification Context
- Section:
- PHYSICS
- Class:
- SIGNALLING
- Subclass:
- SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS