- February, 1950
Started production of Panel Meters and Illuminometers at 2145 Yorii, Shibukawa, Gunma.
- September, 1950
Establishment of Mitsuhashi Electric Tool Manufacturing Co., Ltd.
- October, 1952
Changed the company name to Nihon Seimitsu Sokki Co., Ltd.
- July, 1965
Started production of Blood Pressure Monitors.
- October, 1971
Establishment of Niigata Keiki Co., Ltd.
- September, 1975
Started marketing of the Digital Blood Pressure Monitor ES-200.
- May, 1977
Purchase of Oze Keiki Co., Ltd.
- May, 1987
Started marketing of Auto Irises for Surveillance Cameras.
- March, 1995
Started exporting of the Wrist Type Digital Blood Pressure Monitor WS-200.
- May, 1996
Certified to ISO-9001 and EN-46001 by TUV SUD Japan.
- February, 1997
Establishment of PT. NSS Indonesia
- May, 1999
Relocation of Head Office to 2508-13, Nakago, Komochi, Kitagunma, Gunma （Present address: Shibukawa, Gunma）
- March, 2005
Certified to ISO-14001 by TUV SUD Japan.
- October, 2005
Started production of the Pulse Oximeter OX-700 (Oxi-heart).
- March, 2006
Started production of the Portable Air Massager AM-7 (Putifino).
- August, 2006
Establishment of NISSEI International Trading (Shangahi) Co., Ltd. in China
- October, 2006
The Pulse Oximeter OX-700 (Oxi-heart) received a Small and Medium Enterprises Secretary Special Prize and Good Design Award 2006.
- October, 2006
Started prodution of Mercury Image Digital Blood Pressure Monitor DM-3000.
- February, 2007
Relocation of Tokyo Buisiness Office to 2-27-13, Hongo, Bunkyo-ku, Tokyo
- September, 2007
Establishment of Takasaki R&D Center
- February, 2009
Started production of the Pulse Oximeter pulsfit BO-800.
- November, 2009
Started production of the Pulse Oximeter pulsfit BO-600.
- February, 2010
Started production of the Pulse Oximeter pulsfit BO-800DX.
- March, 2010
Establishment of NISSEI Precision Instruments(Suzhou) Co., Ltd. in China
- June, 2010
Relocation of R&D Center to 2-27-13, Hongo, Bunkyo-ku, Tokyo
- July, 2010
Oze Keiki Co., Ltd. (The Surviving company) and Niigata Keiki Co., Ltd.have been merged, and the Surviving company name would be replaced by "NISSEI ON-TECHNO CO., LTD."
- September, 2011
Started production of the DSK&WSK series.
Clinically validated by ESH(European Society of Hypertension) IP-2010 protocol.
- February, 2012
Started production of the RADCOUNTER DC-100.
- April, 2013
Relocation of Tokyo Buisiness Office and R&D Center to 2-27-18, Hongo, Bunkyo-ku, Tokyo
- April, 2014
Started production of the PulNeo series.