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1890 |
|
Magnetic Single Switch (First Switch in Japan) |
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1891 |
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First serial duplex exchange trials |
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1898 |
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Magnetic Parallel Compound Switch Adopted |
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1903 |
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First Common-Battery Switch in Japan Adopted at Kyoto Office |
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1912 |
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No.1 Large Common-Battery Long Distance Switch Adopted |
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1926 |
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Japan's First Automated Switching Equipment (Introduction of Type A Switchboards) |
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|
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Japan's First Automated Switching Equipment (Introduction of Type H Switchboards) |
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1927 |
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The No. 3 Large-Scale Common-Battery Intercity Exchange |
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1955 |
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Crossbar switching equipment |
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1959 |
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Crossbar automatic exchange introduced for long distance calls |
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1972 |
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D10 Electronic Switching Equipment |
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1982 |
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D60 Electronic Switching Equipment |
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1983 |
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D70 automatic exchange (LS) starts operation |
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