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jan 1, 1967 - 120V/240V at 60 Hz or 50 Hz was established as the standard.
Description:
Note: Date is not exact.
Added to timeline:
Events Leading to 120V Decision in the US
By
Ethan Yang
11 Oct 2018
0
0
749
Date:
jan 1, 1967
Now
~ 58 years ago
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