G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
G08B5/00—Visible signalling systems, e.g. visible personal calling systems or remote indication of seats occupied
G08B5/22—Visible signalling systems, e.g. visible personal calling systems or remote indication of seats occupied using electric transmission; using electromagnetic transmission
G08B5/221—Local indication of seats occupied in a facility, e.g. in a theatre
Landscapes
Physics & Mathematics
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Electromagnetism
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General Physics & Mathematics
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Time Recorders, Dirve Recorders, Access Control
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