| 1949 |
Tokyo Seimitsu Kogu Co., Ltd. is established Appoints Kozo TOJIMA as chairman : 東京精密工具(株) |
| 1950 |
Appoints Gonzo ISAHAYA as chairman |
| 1951 |
Commences manufacture and sale of measuring machines using mechanical gauges |
| 1952 |
Develops Japan's first flow type air micrometer : 日本初高圧流量式空気マイクロメーター |
| 1955 |
Appoints Makoto TAKAGI as chairman |
| 1957 |
Develops Japan's first LVDT type electric micrometer Establishes : Daiichi Seiki Co., Ltd. |
| 1958 |
Develops Japan's first germanium pellet auto-sorter : 世界初ゲルマニウムペレット厚さ自動選別機 |
| 1962 |
Renames the Company as Tokyo Seimitsu Co., Ltd. : Stock is listed on the Tokyo Stock Exchange 2nd Section : Develops surface texture measuring instrument |
| 1963 |
Develops Japan's first wafer slicing machine Opens Hachioji Plant |
| 1964 |
Develops first wafer probing machine in Japan Commences sales of turn-key plant and production technology for electric and air micrometers to China : 1964年1967年 |
| 1967 |
Develops cylindrical form measuring instruments |
| 1969 |
Establishes Tosei Engineering Service Co., Ltd. (currently Tosei Engineering Corp.) : Opens Tsuchiura Plant : Develops Japan's first coordinate measuring machine : evolution_05 : evolution_06 : evolution_07 |
| 1970 |
Develops wafer dicing machine |
| 1980 |
Appoints Akira MIURA as chairman |
| 1985 |
Establishes Tosei Systems Co., Ltd. jointly with CEC as a software development group |
| 1986 |
Stock is listed on the Tokyo Stock Exchange 1st Section : Appoints Goro IMAZAWA as chairman |
| 1987 |
Establishes Research Laboratory |
| 1988 |
Appoints Shozaburo KARUBE as chairman |
| 1989 |
Establishes TOKYO SEIMITSU EUROPE GmbH (GERMANY) and TOKYO SEIMITSU AMERICA, INC. (USA) |
| 1992 |
Appoints Hideo OHTSUBO as chairman : Acquires Silicon Technology Corporation (STC) of the United States : Establishes TSK Service Center in Korea : Renames Daiichi Seiki Co., Ltd. as Micro Technologies Co., Ltd. |
| 1994 |
ISO 9001 certification is awarded to the Hachioji and Tsuchiura Plants : Hachioji Plant attains business license under the traceability system of the Measurement Law for the calibration of the "length measurement laser" : Establishes Beijing Representative Office is established : Establishes TOKYO SEIMITSU (MALAYSIA) SDN. BHD. : 計量法トレーサビリティ制度に基づく長さ測定用レーザの校正認定事業者 |
| 1995 |
Tsuchiura Plant attains business license under the traceability system of the Measurement Law for the calibration of the "block gauge" : Sets up Sanmenxia Zhongyuan Tokyo Seimitsu Co., Ltd. as a joint venture enterprise with Zhongyuan Measuring Instrument Co., Ltd. of China : Establishes TSK AMERICA, INC. and TSK MANUFACTURING COMPANY in the United States : Enters into partnership with Carl Zeiss in the field of high precision measuring instruments : Concludes licensing agreement with Kulicke and Soffa Industries, Inc. of the United States for the sale of dicing machines : 計量法トレーサビリティ制度に基づく端度器（ブロックゲージ）の校正認定事業者 |
| 1996 |
Receives "10 BEST Award" for "Customer satisfaction with a semiconductor equipment supplier" (Survey by VLSI Research Inc.) : Establishes TSK Technical Center in Hsinchu, Taiwan : Establishes TOKYO SEIMITSU (ISRAEL) LTD. : 半導体製造装置サプライヤー顧客満足度調査（VLSIリサーチ社調べ）で10 BEST賞を受賞 |
| 1997 |
Opens New Nagoya Plant of Tosei Engineering : Receives "10 BEST Award" for 2nd consecutive year : Establishes TOKYO SEIMITSU (SINGAPORE) PTE. LTD. : Integrates U.S. subsidiaries into TSK AMERICA, INC. |
| 1998 |
Hachioji and Tsuchiura plants obtain ISO 14001 certification : Receives "10 BEST Award" for 3rd consecutive year : ISO 14001の認証取得 |
| 2007 |
Establishment of Accretech Korea Co., Ltd. |
| 2007 |
MAHOH DICING MACHINE was granted the Chairman' Award of The Japan Machinery Federation at its 27th JMF Award for Energy-Conserving Machinery. |
| 2007 |
Received the "10 BEST Awards" in two categories: awarded for 12 consecutive years in the Test & Material Handing Equipment category, and for 6 consecutive years in the Assembly Equipment category. |
| 2007 |
Obtained a business license at Tsuchiura Plant under the traceability system of the Measurement Law for the calibration of the "length measurement laser" and "3D Coordinate Measuring Machine". |
| 2007 |
Separation of roles of C E O & C O O. |
| 2007 |
Kazuo FUJIMORI named C O O. |
| 2007 |
Establishment of ACCRETECH Taiwan Co., Ltd. |
| 2008 |
Received the "10 BEST Awards" in two categories: awarded for 13 consecutive years in the Test & Material Handing Equipment category, and for 7 consecutive years in the Assembly Equipment category. |
| 2008 |
Technical cooperation with Mitaka Kohki Co., Ltd in non-contact metrology. |
| 2009 |
Establishment of Tokyo Seimitsu USA Branch. |
| 2009 |
Appointment of Mr. Kazuo FUJIMORI as CEO. |
| 2011 |
Appointment of Mr. Kunimasa OTA as CEO. |
| 2011 |
Started mass-production of "AD3000T/S" of the world's smallest and fastest dicing machine in the most advanced semiconductor line. |
| 2011 |
Establishment of the local corporation, Tokyo Seimitsu （Thailand） Co., Ltd.. |
| 2012 |
Establishment of "ACCRETECH Application Center" corresponding to the diversification of the device process. |
| 2012 |
Began manufacturing, development and sales upon "the acquisition of precision blade business" from Mitsubishi Materials. |
| 2012 |
Opened the representative office Tokyo Seimitsu Co., Ltd. Indonesia. |
| 2013 |
Establishment of the local corporation, ACCRETECH Vietnam Co.,. |
| 2013 |
Released non-contact sensor "Opt-measure." |
| 2015 |
Appointment of Mr. Hitoshi YOSHIDA as CEO. |
| 2015 |
Released Non-contacted/three-dimensional surface roughness and contour measuring instrument "Opt-scope." |
| 2015 |
Establishment of PT. ACCRETECH Indonesia. |
| 2015 |
Establishment of ACCRETECH ADAMAS （Thailand）Co., Ltd. |
| 2016 |
Construction of new plant (No.6 Plant） in Hachioji was completed. |
| 2016 |
Tsuchiura plant of Metrology Company obtained the certification of JIS Q 9100 (Scope of Certification: Shape measurement of order received parts). |
| 2017 |
Cooperated with Panasonic Factory Solutions Co., Ltd. in the development of laser grooving devices. |
| 2017 |
Published the ACCRETECH Declaration on Women's Advancement. |
| 2017 |
Released high accuracy CNC coordinate measuring machine XYZAX AXCEL. |
| 2017 |
Released SURFCOM TOUCH series of intuitive operation type surface texture measuring instruments. |
| 2018 |
Released RONDCOM CREST, ultra-high precision roundness and cylindrical profile measuring instrument. |
| 2018 |
Released AltaProv, multi-stage prober for wafer collective measurement. |
| 2019 |
Purchased a majority shareholding in Fujitsu Telecom Networks Fukushima Limited (now Accretech Powertro System Co., Ltd.) which provides Charge/Discharge testing systems and became a subsidiary. |
| 2019 |
Tosei Engineering Corp. and its subsidiary Tosei America Inc. acquired the balancer business from the US manufacturer Schmitt Industries Inc. |
| 2020 |
Renovation for expanding sales and service/support capability of Osaka branch was completed. |
| 2020 |
Construction of new plant (MI Building) in Tsuchiura was completed. |
| 2021 |
Construction of new building for Tokyo Seimitsu subsidiary Accretech Taiwan Co., Ltd was completed. |
| 2021 |
New Taiwan Application Center was opened. |
| 2022 |
Appointment of Mr. Hitoshi Yoshida as Chairman and CEO. |
| 2022 |
Appointment of Mr. Ryuichi Kimura as President and COO. |
| 2022 |
Due to the revision of the market classification of the Tokyo Stock Exchange, the Company moved to the Prime Segment. |
| 2025 |
Construction of Nagoya plant of Tosei Engineering was completed : Nagoya |
