using electric transmission; using electromagnetic transmission

Introduced: September 1968

Last revised: January 2006

Full Title

Visible signalling systems, e.g. visible personal calling systems or remote indication of seats occupied > using electric transmission; using electromagnetic transmission

Classification Context

Section:: PHYSICS
Class:: SIGNALLING
Subclass:: SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS

3 direct subcodes

Child Classifications

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G08B 5/24 with indicator element moving about a pivot, e.g. hinged flap or rotating vane
G08B 5/32 with indicator element moving rectilinearly
G08B 5/36 using visible light sources