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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7/00
Signalling systems according to two or more of groups G08B3/00 - G08B6/00
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G08B7/06
using electric transmission; , e.g. involving audible and visible signalling through the use of sound and light sources
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G08B7/062
indicating emergency exits
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