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2016
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In the US, when was the standard "two prong" electrical outlet set? What about the three prong plug? What was used before that was an established standard?
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In the US, when was the standard "two prong" electrical outlet set? What about the three prong plug? What was used before that was an established standard?
26
--
10
9
8
7
6
5
4
3
2
1
0
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