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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3/00
Audible signalling systems, e.g. audible personal calling systems
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G08B3/10
using electric transmission; using electromagnetic transmission
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G08B3/1008
Personal calling arrangements or devices, i.e. paging systems
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G08B3/1016
using wireless transmission
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G08B3/1025
Paging receivers with audible signalling details
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G08B3/1033
with voice message alert
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