Rare Smoke Detectors

One thing that wasn’t in good shape was the 9 Volt battery. It still got sent inside a ziploc bag with everything else. Very corroded! I included it in one of the pics. Also featured is a small red coloured letter from the Office Of The California State Fire Marshal. It is dated July 2, 1976 (original date 6/15/76). Interesting extra piece of info. I included it in the pic too.