| 1947, March |
Kentaro Kirihara started Kirihara Electro Plating Company in Tomioka.
Nickel and Chromium plating were started. |
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| 1959, November |
Incorporated and change company name toKirihara Electro Plating Co, Ltd. |
| 1962,June |
Authorized as a Small and Medium Rational Model Company byThe Small and Medium Enterprise Agency. |
| 1965,September |
Established Tong Yong Electro Plating in Hong Kong. |
| 1973,June |
Built a New Factory in Tomioka Industrial Park. |
| 1976,August |
Moved to the New Factory completely. 
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| 1983,December |
Increased capital to 10,000,000yen. |
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| 1986,April |
Masaaki Kirihara became the representative President. |
| 1992,June |
Installed new equipment and automatic plating lines. |
| 1997,May |
Change the company to ERG CO., LTD. |
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| 2000,March |
Built a new office. |
| 2000,May |
Acquire a Certificate ISO 9002(revised in October,2004 ISO9001:2000). |
| 2000,July |
Increased capital to 20,000,000yen . |
| 2003,July |
Acquire a Certificate ISO 14001:2004. |
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| 2005, March |
Build No.2 Plant, Transfer Precious Material Department. |