If you look at a old (pre GTE Sylvania)Zinsco,it will say "Zinsco Electrical Products Los Angeles Calif."and one of those really old clay pigeon substitutes,will say "Magnetrip".
P.S. I suspect they had more national distribution after GTE bought them in the 1970s. They were very popular in apartment buildings,trailers and other structures wired by bottom feeders.
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