History
| NOV '57 | Founded as koyo juseki Seisakusho in kanagawa, 20 miles south of Tokyo. |
|---|---|
| OCT '60 | Yamanashi Plant began operation in Tsuru-city, Yamanashi. |
| OCT '65 | Quartz Vibrator Division formed. |
| AUG '71 | Company name changed to koyo Precision Co.,Ltd. |
| JUL '76 | Fujiyoshida Plant completed. |
| MAY '82 | Crystal Oscillator Division began operation. |
| DEC '84 | Asumi Plant completed. |
| SEP '90 | Asumi Plant equipped with clean-room system and became the main factory. |
| OCT '92 | Main office moved to Koasumi, the current location. |
| SEP '04 | Reduction capital to Yen 10 million. |
| SEP '05 | Moved the Crystal polish process from Tsuru Factory to Head-quaters one. |
| Oct '07 | Get the certification of ISO9001. |
