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UL 464-2016 pdf download – Audible Signaling Devices for Fire Alarm and Signaling Systems, Including Accessories UL Standards free download

UL 464-2016 pdf download – Audible Signaling Devices for Fire Alarm and Signaling Systems, Including Accessories

UL 464-2016 pdf download - Audible Signaling Devices for Fire Alarm and Signaling Systems, Including Accessories. 3.3 DUTY CYCLE – The ratio of the sum of all pulse durations to the total period, during a specified period...
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