| 1949 | Founded "Kato Ironworks" at the present location Started the manufacture of small precision parts |
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| 1953 | With the development of business, the group was reorganized as a corporate organization with a capital of 600,000 yen and changed the company name to "Kato Seiki Ltd." |
| 1976 | In order to shed the existing system and promote the strengthening of the corporate structure, changed the corporate organization from "limited company" to "stock company". |
| 1982 | Completed a three-story reinforced concrete building to expand our factory. |
| 1992 | Rebuilt the first factory. and changed a part of three-story building to four stories in order to achieve a high-rise building and to establish corporate culture of "comfortable space", "pleasant time", and "creative mind". |
| 1992 | Introduced CI to clarify our corporate vision for the new century. Changed the company name from "Kato Seiki Co., Ltd." to "AVEX" as the second foundation of the business. |
| 1993 | With the fourth increase of capital to 10 million yen, reinforced our corporate structure. |
| 1999 | Acquired ISO9002 certification in commemoration of the 50th anniversary. |
| October 2003 | Underwent an inspection for transition to ISO9001: 2000 version |
| January 2004 | Founded Tado factory as a production base for worldwide orders. |
| August 2006 | Completed the Phase 2 extension work to expand production capability. |
| November 2009 | Issued commemorative publication for the 60th anniversary. |
| June 2010 | Takenori Kato was appointed as the new president and representative director Akihiko Kato was appointed as a chairman and representative director |
| December 2011 | Started "Kaizu Research Institute" aiming for more efficient production in cutting processes. |