41
/
AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
May 31, 2026
1870102
153377
2
Public Timelines
FAQ

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:

Date:

jan 1, 1967
Now
~ 59 years ago