with reset means necessitating a separate operation to return the indicator element

Full Title

Visible signalling systems, e.g. visible personal calling systems or remote indication of seats occupied > using electric transmission; using electromagnetic transmission > with indicator element moving about a pivot, e.g. hinged flap or rotating vane > with reset means necessitating a separate operation to return the indicator element

Classification Context

Section:

PHYSICS

Class:

SIGNALLING

Subclass:

SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS