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I had no idea that Southern California was on 50 Hz power at one point. Just did some reading up on it, and indeed it was -- until 1948. It was a sizeable market, so manufacturers made special versions of all kinds of products specifically for Southern California. Amazing!
Japan today is still cut in half -- 50 Hz in one half, and 60 Hz in the other. When the electric trains cross the boundary, they coast without power a short distance and pick up the new frequency after a few seconds. They should have made the switch like Southern California did long ago.
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