
- May, 1954:
- Established Ohmatsu Denki Co., Ltd. at 2596, Kamimeguro 5-chome, Meguro City, Tokyo.
- January, 1959:
- Established Ohmatsu Seiko Co., Ltd. spin off from the machinery division of the company.
- August, 1960:
- Purchased the land at the current place of Kohoku-ku, Yokohama City due to the business expansion by the development of new products and completed the first phase of construction and moved to this site.
- November, 1963:
- Established Osaka Sales Office.
- February, 1964:
- Completion of the second phase of construction of Head Office Building.
- May, 1966:
- Unified the name to LEADR ELECTRONICS CORPORATION.
- August, 1969:
- Completion of Osaka Sales Office Building at 7-9, Kitahorie 2-chome and moved there.
- Septmber,1969:
- Established LEADER INSTRUMENTS CORP. as an overseas affiliated company in New York.
- October, 1969:
- Established Northern Kanto Sales Office.
- November,1969:
- Established Nagoya Sales Office.
- January, 1971:
- Established Sendai Sales Office.
- June, 1972:
- Established Fukuoka Sales Office.
- November, 1976:
- Received Letter of Goodwill from Kanagawa Taxation Office as a good tax declaration company.
- October, 1977:
- Completion of Northern Kanto Sales Office Building at 31-12, Ekiminami-cho 4-chome, Oyama City, Tochigi Pref. and moved there.
- October, 1977:
- Closed Nagoya Sales Office and established Tokai Sales Office at 164, Barajima-cho, Hamamatsu City.
- September, 1979:
- Completion of LEADER INSTRUMENTS CORP. N.Y. Building.
- July, 1980:
- Established LEADER INSTRUMENTS (H.K.) LTD. as an overseas affiliated company in Hong Kong.
- June, 1981:
- Received a Letter of Goodwill from Kanagawa Taxation Office as a good tax declaration company.
- August, 1981:
- Completion of Sendai Sales Office at 1-67, Tsurushiro-machi, Wakabayashi-ku, Sendai City and moved there.
- December, 1983:
- Completion of Tokai Sales Office at 309-2, Nishizuka-cho, Hamamatsu City and moved there.
- May, 1984:
- Completion of Fukuoka Sales Office at 10-26, Shiobara 3-chome Fukuoka City and moved there.
- March, 1986:
- Built Tsunashima Factory anew at 10-35, Tsunashima-higashi 5-chome, Kohoku-ku, Yokoyama City and moved a part of production division over there.
- June, 1986:
- Received a Letter of Goodwill from Kanagawa Taxation Sales Office as a good tax declaration company.
- November, 1986:
- Built Head Office Main Building anew and moved departments of technology and administration there.
- May, 1987:
- Changed the company name of Ohmatsu Seiko Co., Ltd. to OM Metal Co., Ltd.
- August, 1987:
- Completion of Los Angels Office of an overseas affiliated company in America.
- April, 1988:
- Established a resident office in England.
- April,1989:
- Merged OM Metal Co., Ltd. an affiliated company, (started as a department).
- December, 1989:
- Established LEADER INSTRUMENTS (EUROPE) LTD. as an overseas affiliated company in England.
- March, 1990:
- Issued corporate debentures.
- May, 1990:
- Established Hokuriku Sales Office at 4-21, Takaoka-cho, Kanazawa City.
- November, 1990:
- Established Singapore Resident Office in Singapore.
- November, 1991:
- Started stock exchange as Japan Securities Dealers Association Quotation System.
- April, 1992:
- Established Kanetsu Sales Office at 515-1, Kamikawakami, Kumagaya City, Saitama Pref.
- April,1992:
- Established Koshin Sales Office at 3-28, Shiraita 2-chome, Matsumoto City, Nagano Pref.
- July, 1994:
- Established LEADER INSTRUMENTS ASIA PTE., LTD. in Singapore.
- December, 1994:
- Certified according to ISO9002 by International Standardization Organization.
- April, 1995:
- Closed Tokai Sales Office and set up Chubu Sales Office at 702, Toyogaoka, Meito-ku, Nagoya City.
- April, 1996:
- Moved Head Office Factory to 11-28, Tsunashima-higashi 6-chome, Kohoku-ku, Yokohama City.
- March, 1998:
- Certified according to upgraded ISO9001 by International Standardization Organization.
- April, 1998:
- Closed Koshin Sales Office and merged into Chubu Sales Office.
- August, 1999:
- Closed Kitakanto Sales Office and merged into Sales Department of Head Office.
- August, 1999:
- Moved Kanetsu Sales Office to 219-102, Hakota, Kumagaya City, Saitama Pref.
- October, 1999:
- Liquidated LEADER INSTRUMENTS (EUROPE) LTD. in Europe.
- November, 2000:
- Moved Kansai Sales Office to 4-1, Hiroshiba-cho, Suita City, Osaka Pref.
- March, 2001:
- Moved Kanetsu Sales Office to 136, Honcho 2-chome, Kumagaya City, Saitama Pref.
- March, 2002:
- Liquidated LEADER INSTRUMENTS ASIA PTE., LTD. in Singapore.
- April, 2003:
- Established Beijing Resident Office in Beijing in China.
- April, 2003:
- Established Dong Guan Resident Office of LEADER INSTRUMENTS (HK) LTD., in
Dong Guan in China.
- December, 2003:
- Closed Kyusyu Sales Office and merged into Kansai Sales Office.
- March, 2004:
- Closed Hokuriku Sales Office and merged into Chubu Sales Office.
- October, 2004:
- Established Shanghai Resident Office in Shanghai, China.
- December, 2004:
- Cancelled the OTC registration of Japan Securities Dealers Association Quotation System and Listed in Jasdaq Securities Exchange
- February, 2005
- Renewed Head Office Building and merged Research Facility into the head office.
- June, 2006:
- Established Service Center in Beijing, China.
- September, 2006:
- Established Europe Resident Office in Netherland.
- April, 2009:
- Closed Dong Guan Resident Office in China and merged into LEADER INSTRUMENTS (HK) LTD.
- June, 2009:
- Closed Tohoku Sales Office and merged into Kan-etsu Sales Office.