IPC Subgroup
G08B 3/06 using hydraulic transmission; using pneumatic transmission
Introduced: September 1968
Last revised: January 2006
Full Title
Audible signalling systems, e.g. audible personal calling systems > using hydraulic transmission; using pneumatic transmission
Classification Context
- Section:
- PHYSICS
- Class:
- SIGNALLING
- Subclass:
- SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS