| February, 1951 | Former President, Masao Yamaki, established a private company at Radio Center in Akihabara, Tokyo. The company handled and sold of electronic tests & measurement products and electronics parts mainly to educational institutions, such as universities and laboratories of large companies. |
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| January, 1957 | Reorganized and established Toyo Keisokuki Trading Department as a limited company. Capital: $5,000. |
| July, 1969 | Company name changed to Toyo Keisokuki Co., Ltd |
| April, 1971 | Moved Head Office to the present location, 1-3-12 Sotokanda, Chiyoda-ku, Tokyo. Consisted of 3 shops: Radio Center Shop 1, 2 and Head Office Shop. |
| December, 1974 | Capital increased to $20,000.- |
| March, 1980 | Hidetsugu Yamaki joined Toyo Keisokuki Co., Ltd. Worked at Leader Electronic Corporation from 1977. |
| February, 1983 | Capital increased to $40,000.- |
| October. 1989 | Hidetsugu Yamaki was appointed as CEO of Toyo Keisokuki Co., Ltd. |
| February, 1985 | Capital increased to $120,000.- |
| April, 1986 | Started sales of guaranteed used test measurement instruments and PCs by sponsorship ORIX Rentec, Yokogawa Rental & Lease and Nippon Elevator. |
| April, 1987 | Completion of Keisokuki-land Building at current location. Keisokuki-land Showroom opened on the second floor. It was the first in the industry to exhibit brand new instruments by major manufacturers. |
| June, 1988 | Established Custom Corporation as a Manufacturing Division. Started OEM products manufacturing under the Custom brand. |
| July, 1992 | Opened Radio Center Shop 3. Started sales of physics and chemistry equipment at Shop 2. Opened Used Products Sales Center on the 3rd floor in Keisokuki-land Building. |
| March, 1995 | Established Toyo Tech Co., Ltd. In the calibration business sector. |
| September, 1995 | Signed business partnership with Sytech, former Sanyo Electronic Trading Co., Ltd. (Korea). |
| December, 1996 | Toyo Tech Co., Ltd acquired the ISO-9002 certification. |
| April, 1997 | Opened guaranteed used PC shop named ORIX Rentec Akihabara Sales Center PC Land next to Keisokuki-land Building. |
| October, 1999 | Opened guaranteed used PC sales floor PC Friends on the 5th floor in Keisokuki-land Building. |
| November, 1999 | Business alliance with Toyotech Eengineering Sdn. Bhd in Malaysia as an overseas base of the calibration business. |
| February, 2000 | Established Inforus Inc. Japan in Vietnam as an overseas base of the calibration business. |
| July, 2000 | Toyo Tech Co., Ltd acquired ISO/IEC Guide 21. |
| October, 2000 | TOYO TECH CO., LTD acquired ISO/IEC Guide 21. |
| October, 2001 | Established Toyo Soluna Tech Co. Ltd. as a foreign base of the calibration business in Hong Kong and Zhuhai in China. |
| February, 2002 | Opened eating and drinking place named Chakra on B1 of Keisokuki-land Building as one of the businesses of Toyo Keisokuki Group Company, M I Planning Co., Ltd. |
| December, 2003 | Opened Radio Center Shop 3 as Fluke Shop. |
| December, 2004 | OPEN! Radio Center Shop 3 as “FLUKE SHOP”. |
| June, 2008 | Opened Hioki Shop in Radio Center. |
| February, 2011 | Signed exclusive distributor agreement in Japan with Picotest, test & measurement manufacturer in Taiwan. |
| November, 2013 | Signed exclusive distributor agreement with the Wireless Communication and Design and Development Service Division of RTX A/S of Denmark. Main products are DECT Tester and Bluetooth Testers. Territories are Japan, Japanese companies in the world and South Asian countries. |
| June, 2014 | Established Toyotech Vietnam in Ho Chi Minh City as a calibration and sales company in Vietnam. |
| January, 2015 | Signed Tier 1 Distributor Agreement with US company Netscout Systems regarding its tool business, manufacturer of handheld products for wired/wireless network trouble shooting, and PC-based Wi-Fi network environment surveys and analysis products. |
| July, 2016 | Opened food and bar Gauge as one of the businesses of M I Planning Co., Ltd on the 1st floor in Keisokuki-land Building. |
| August, 2019 | Signed Tier 1 Value Added Distributor Agreement with LinkRunner LLC of US which is former NETSCOUT Tool Business Division. It established new company and the brand name is “NetAlly”. Continue to develop and manufacture Handheld products for Wired/Wireless Network trouble shooting and PC based WiFi Network Environment Survey and Analysis products. |
| October, 2019 | Signed Exclusive Distributor Agreement with UNI-Trend Technology of China. Manufacturer of Handheld General Meter, Crump Meter, Environmental Tester, Benchtop Instruments, … |