Found the company that made it.Got a question for the Brain Trust. I figure out of the regulars, we've got a few hundred years on knowledge. I found this in an attic of an old house I renovated years ago. It was something I'd never seen before, pretty heavy, and tweaked my curiosity. I snagged it up and brought it home. I've done all the research I can find. The company that made it was from Chicago, and did a lot of work for the government. Any ideas?
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https://www.revereelectric.com/History