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My high school auditorium back in the 80's had one of those!
The gong man! Those were the days. I only designed and speced a few of these.
I'm not sure quite what you have in this system, if even the pipe and wire for branch circuits can be reused, nor do I know if you have nay other existing equipment; but do consider just getting...
image not clear enough to read. Try posting closer shots. That said, wild guess, lighting control
Very Nice !!