IPC Main Group
G08B 3/00 Audible signalling systems, e.g. audible personal calling systems
Introduced: September 1968
Last revised: January 2006
Classification Context
- Section:
- PHYSICS
- Class:
- SIGNALLING
- Subclass:
- SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
Scope Notes
Application references: Whistling kettles In model railways, arrangements for imitating locomotive features, e.g. whistling, signalling, puffing Road surface markings specially adapted for audible or vibrational signalling Acoustical signalling devices on ladders characterised by being mounted on undercarriages or vehicles Indicating the time by acoustic means Producing acoustic time signals by electrical means Telephonic communication systems combined with bell systems
Related Keywords
signalling by using BELL(S)DETONATOR(S) used in signalling
4 direct subcodes
Child Classifications
Navigate with arrow keys, Enter to open