probably in 1800s.
Alessandro Volta invented it.
Newton
the voltage and frequency are 110v and 50(or)60hz because the devices which are invented in us are work at that voltage and it is efficient for that devices.
the year tv was invented
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Tally was invented in the year 1988
Your mom is what year they were invented
It was the same year that they invented the VCR.
Plywood was invented in the year 1865.
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toothbrush was invented in the year 1939
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