| 1951 |
Established the Hokkaido Industry Development Co., Ltd. to do the open-air mining smokeless charcoal that is on the top of the MT. Ohira in Hokkaido. Although the coal mining is started in 1963 found the low calorie coal seam so that closing a mountain and suspension of business due to profit defectiveness. |
| 1963 |
Changed the company name to KYOSEI& head office was moved to current location in Shinjuku-ku, Tokyo, and production of the precise metal parts (the mainly electronic and optical components) by the chemical milling processing of various kinds of metal was started. |
| 1972 Sept |
It is kawagoe factory construction in Kawajima-machi, Saitama. Starting the product layer magnetism head core production that is major operation for industry. In 1977 the secondary processing it becomes the consistency production maker of our country sole chemical milling method. |
| 1984 Jul |
Head Office building the fourth floor be built, and a building is completed. In October extend the new factory in the Kawagoe Factory and install the full automatic line of chemical milling. |
| 1988 Oct |
Established joint company with K.R.PRECISION Co., Ltd. in THAILAND for the production of the computer parts. (The suspension production and sales for hard disk magnetism component) |
| 1990 Jan |
Established KYOSEI (the payment capital 50,000,000 yen that is total amount investment) All the business of KYOSEI Co.,Ltd. are succeded. |
| 1994 Jan |
Merged KYOSEI. For the propose of rationalization of management. |
| 1998 Apr |
Evacuated from the managemen of K.R.PRECISION Co.,Ltd. |
| 2002 Oct |
Established KYOSEI FACTORY (THAILAND) Co.,Ltd. in THAILAND. |
