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
G08B5/36—Visible signalling systems, e.g. visible personal calling systems or remote indication of seats occupied using electric transmission; using electromagnetic transmission using visible light sources
Landscapes
Physics & Mathematics
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Electromagnetism
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General Physics & Mathematics
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Developing Agents For Electrophotography
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Diaphragms For Electromechanical Transducers
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Financial Or Insurance-Related Operations Such As Payment And Settlement
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