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Tokyo Metro Tōzai Line was created in 1964.
Tokyo Metro Marunouchi Line was created in 1954.
Tokyo Metro Namboku Line was created in 1991.
Tokyo Metro Yūrakuchō Line was created in 1974.
Tokyo Metro Ginza Line was created in 1927.
Tokyo Metro Hibiya Line was created in 1961.
Tokyo Metro Chiyoda Line was created in 1969.
That sounds like you are looking for the word "fault" or "fault line".
these are the faults that occur in transmission line: 1. line to line fault 2. line to ground fault-this is the most common fault that occurs in tr. line(75%) 3. double line to ground fault 4. triple line to ground (or) 3 phase fault- this is the most serious and dangerous fault that occurs in transmission line.(but rarely occurs)
The fault that caused the 1995 Kobe earthquake was the Nojima fault.
The Denali Fault line is located in Alaska.
San Andreas Fault Line