| Nov. |
1953 |
Ryosan Denki Co., Ltd. (a limited liability company) established in Kanda-Suehirocho, Chiyoda-ku, Tokyo |
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| Mar. |
1957 |
Company reorganized as Ryosan Denki Co., Ltd. |
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| Jan. |
1959 |
Company's head office moved to Kanda-Matsuzumicho, Chiyoda-ku, Tokyo |
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| Oct. |
1963 |
Ryosan Trading Co., Ltd. established |
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| Dec. |
1963 |
Head office moved to new building in Soto-Kanda, Chiyoda-ku, Tokyo (now Soto-Kanda Building) |
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| Mar. |
1966 |
Gyoda Plant established |
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| Jul. |
1968 |
Heat sinks (used for semiconductor circuit elements) manufacturing started at Gyoda Plant |
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| Feb. |
1974 |
Hong Kong Ryosan Limited established |
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| Jun. |
1976 |
Singapore Ryosan Private Limited established |
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| Jan. |
1979 |
Ryotai Corporation established in Taiwan |
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| Apr. |
1980 |
Tsuru Works Co., Ltd. absorbed by merger; Uenohara Plant established |
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| Oct. |
1981 |
Company name changed to Ryosan Co., Ltd. |
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| Jul. |
1983 |
Stock is listed on the Second Section of the Tokyo Stock Exchange |
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| Jun. |
1984 |
Nagoya Distribution Center established |
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| Jun. |
1985 |
Osaka Distribution Center established |
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| Mar. |
1986 |
Stock is listed on the First Section of the Tokyo Stock Exchange |
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| Apr. |
1986 |
Head office moved to Sumitomo Seimei Building in Higashi-Kanda, Chiyoda-ku, Tokyo |
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| Apr. |
1988 |
Ryosan Trading Co., Ltd. absorbed by merger |
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| Feb. |
1992 |
Technology Center established |
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| Apr. |
1992 |
Ryosan Engineering (M) Sdn. Bhd. established |
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| Jun. |
1995 |
Ryosan Engineering (Thailand) Co., Ltd. established |
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| Apr. |
1996 |
Ryosan Technologies USA Inc. established |
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| Nov. |
1997 |
Zhong Ling International Trading (Shanghai) Co., Ltd. established |
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| Nov. |
1999 |
Kawasaki Comprehensive Business Center established |
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| Mar. |
2000 |
Head office moved to Head Office Building, Higashi-Kanda, Chiyoda-ku, Tokyo |
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| Apr. |
2000 |
EC Ryosan Company, Limited established |
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| Feb. |
2001 |
Korea Ryosan Corporation established |
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| Nov. |
2001 |
Ryosan (Thailand) Co., Ltd. established |
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| Apr. |
2002 |
CentrAct Corporation established |
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| Jul. |
2002 |
Ryosan IPC (Malaysia) Sdn. Bhd. established |
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| Dec. |
2002 |
Dalian F.T.Z Ryosan International Trading Co., Ltd. established |
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| Aug. |
2003 |
All offices received ISO 14001 certification |
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| Nov. |
2004 |
Ryosan Electronics (Foshan) Co.,Ltd. established |
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| Feb. |
2008 |
Shen Ling Electronics (Shenzhen) Co.,Ltd. established |
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| Nov. |
2008 |
Saxis Company, Limited established |
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| Nov. |
2008 |
Gyronics Company, Limited established |
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