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| Sept. 16, 1960 |
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Company was established in Tokyo for buying and selling railway construction and mining equipment and materials. |
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| Mar. 10, 1965 |
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Opened Fukuoka Office to meet business expansions. |
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| Sept. 17, 1966 |
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Increased capital to 6 million yen. |
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| Aug. 16, 1967 |
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Increased capital to 9 million yen. |
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| Jun. 5, 1973 |
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Acquired 3,026m2 of industrial land in Yachimata, Chiba Prefecture, and built Chiba Plant. |
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| Sept. 26, 1973 |
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Increased capital to 10 million yen. |
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| Dec. 25, 1973 |
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Corporate headquarters moved to current address at 1-7-6 Ginza, Chuo-ku, Tokyo. |
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| Apr. 1, 1990 |
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Expanded the Chiba Plant by acquiring 940m2 of adjoining land. |
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| Apr. 12, 1993 |
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Acquired plant land of 2,585m2 in Oki, Yachimata, Chiba Prefecture, and built Plant 2. |
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| Jun. 28, 1996 |
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Expanded Plant 2 by acquiring 940m2 of adjoining land. |
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| Feb. 15, 1997 |
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Built plant office and parts warehouse. (Former office building was demolished) |
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| Aug. 1, 2003 |
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Opened Seoul Branch to meet business expansions. |
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| Sept. 1, 2004 |
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Inaugurated DTS Communication Office in Kobe belonging to Corporate Development Dept. to develop and expand new business related to IT. |
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| Jun. 1, 2005 |
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Built Chiba Plant 3 measuring 2,974m2 in area in Yachimata, Chiba Prefecture. |
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