Patent classifications
G
PHYSICS
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G08
SIGNALLING
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G08B
SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
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5/00
Visible signalling systems, e.g. visible personal calling systems or remote indication of seats occupied
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G08B5/22
using electric transmission; using electromagnetic transmission
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G08B5/222
Personal calling arrangements or devices, i.e. paging systems
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