COOL! I sure hope you get that set figured out. I love to tackle a mystery like that. It sure does look like some sort of training chassis . I wonder if it would do any good to browse some 60s/early 70s electronics magazines to see if a picture of that chassis shows up in the advertising for any of the technical schools of the day. Although it seems very unlikely, my thoughts keep wandering back to the idea of a homebrew set designed and built by some meticulous engineer.....Just for fun, of course.
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