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Re: Who knows what this is?
As a fan of old black and movies from the 30s & 40s I recently saw a movie (forgot the name) where the burglars are practicing for days to disarm an automatic burglar alarm. Then they pull the big bank job!
It was simply some magnetic switches on the doors and windows that activated the alarm. Compared to having a human security officer 24-7 it would be considered automatic for the 30s.
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