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using a supplementary light source for emergency lighting
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Industry
CPC
F21S9/024
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Parent Industries
F
MECHANICAL ENGINEERING LIGHTING HEATING WEAPONS BLASTING ENGINES OR PUMPS
F21
Lighting
F21S
NON-PORTABLE LIGHTING DEVICES OR SYSTEMS THEREOF
F21S9/00
Lighting devices with a built-in power supply Systems employing lighting devices with a built-in power supply
Current Industry
F21S9/024
using a supplementary light source for emergency lighting
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