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IEC 60839-2-3 Ed. 1.0 b:1987
M00000899
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IEC 60839-2-3 Ed. 1.0 b:1987 Alarm systems. Part 2: Requirements for intruder alarm systems. Section Three: Requirements for infrared-beam interruption detectors in buildings
standard by International Electrotechnical Commission, 12/30/1987
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