Model 710 battery compartment on top; uses (3) 4.5V Alkaline batteries, mallory PX-21. Made by Statitrol for Sears prior to UL approval.
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Statitrol Corporation, "Statitrol Sears Model 710 - top" (1970). MS055-08-0001 - 0003 images. 6.
small business, smoke detectors, fire protection, fire safety