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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 |
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Electric relays |
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| 1921 |
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Electric railway signaling equipment

Electric railway signaling equipment
Impedance bond |
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| 1923 |
Tokyo Office established. |
 Electro-mechanically-operated interlocking device |
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| 1925 |
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First domestically-produced railway crossing alarm

Electric switch |
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| 1926 |
Company name changed to Kyosan Electric Mfg. Co., Ltd. |
 Electric interlocking device |
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| 1928 |
Constructed and transferred corporate offices and factory to the present location.

Moving to Tsurumi
Merged limited partnership Kyosan Shokai and Nippon Electric Application Co., Ltd. |
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| 1930 |
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Automatic blocking device for single tacks |
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| 1931 |
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Traffic signal equipment

Copper suboxide rectifiers
Compact-car (Kyosan-Go)

Kyosan-Go |
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| 1932 |
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Trim arm type ATS device |
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| 1933 |
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Relay interlocking equipment |
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| 1935 |
Osaka Satellite Office (currently Osaka Branch)established. |
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| 1936 |
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CTC equipment

CTC equipment |
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| 1938 |
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Systematic traffic signal controller |