I mentioned this in another thread, but I came across an old Butler Bell system in a Victorian house last year. The owner wanted it kept in place and made fully functional.

The kitchen panel -- glass in a wooden surround -- had a dozen or so solenoid swinger arms all neatly wired to brass terminal blocks along the edge. Only about two circuits worked due to the old (probably 1920s) cable having deteriorated so badly. All 12V with a series bell. It took many hours of unplanned for work, but I got it going in the end.

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Ah, memories... BTW, When's Joe getting the nostalgia page up?
Good question -- Joe? Bill?