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Japan is the only country in the world to use 100v AC, and that the frequency varies (50hz in the east, 60hz in the west) because they bought equipment from two different manufacturers/countries
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Fun Fact: Japan is the only country in the world to use 100v AC, and that the frequency varies (50hz in the east, 60hz in the west) because they bought equipment from two different manufacturers/countries
Source
en.wikipedia.org
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