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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17/00
Fire alarms; Alarms responsive to explosion
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G08B17/10
Actuation by presence of smoke or gases; , e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
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G08B17/103
using a light emitting and receiving device
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G08B17/107
for detecting light-scattering due to smoke
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