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- History of Kyosan Electric Manufacturing Company
- Overall Chronology
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| Name of an Era | Company History | Product Chronology | ||
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| 1917 | Company established as Tokyo Denki Kogyo Co., Ltd., in Kanda-Awajicho,Tokyo. Commenced manufacture of electro-medical apparatus and other electrical machinery and devices. |
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| 1920 |  Electric relay |
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| 1921 |  Electric railway signaling equipment Electric railway signaling equipment Impedance bond |
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| 1923 | Tokyo Office established. | Electro-mechanicall yoperated interlocking device |
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| 1925 | First domestically-produced railway crossing alarm Electric point machine |
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| 1926 | Company name changed to Kyosan Electric Manufacturing Co., Ltd. |
Electric interlocking equipment |
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| 1928 | Constructed and transferred corporate offices and factory to the present location.  When moving to Tsurumi Merged with the limited partnership Kyosan Shokai and with Nippon Electric Application Co., Ltd. |
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| 1930 | Automatic blocking device for single tacks |
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| 1931 | Traffic signal equipment Cuprous oxide rectifier Compact car (named Kyosan-go) Kyosan-Go |
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| 1932 | Trim arm type ATS device | |||
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| 1933 | Relay interlocking equipment | |||
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| 1935 | Osaka Satellite Office (currently Osaka Branch)established. |
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| 1936 | CTC equipment CTC equipment |
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| 1938 | Systematic traffic signal controller | |||
