Smokegard model 720 is ICBO listed product-see report No. 2892 BOCA 74-26; U.S. Patent 3778800, Pat.Pending Worldwide. Factory Mutual approved, no UL listing; uses (3) 4.5V Batteries, mallory PX-21.
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Statitrol Corporation, "Statitrol Smokegard II Model 720 - front" (1970). MS055-08-0001 - 0003 images. 7.
small business, smoke detectors, fire protection, fire safety