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| 1954 | Established as the first manufacturer of Variable Area Flowmeter in Japan by Mr. T. Takanoyama |
|---|---|
| 1957 | Level instruments (Mechanical) added to line |
| 1969 | Servo operated type Tank Gauge released |
| 1972 | Overseas Dept established |
| 1973 | Metal tube type Micro Flowmeter released |
| 1977 | Thermal Flowmeter released |
| 1979 | Tank gauges for Marine Tanker released |
| 1980 | Certified as the approved manufacturer by High-Pressure Gas Application Regulation |
| 1981 | Collaboration agreement with Krohne Messtechnik of Germany Magnetic flowmeter newly released |
| 1982 | CATAMS (Computer-Aided Tank Monitoring System) introduced |
| 1983 | Thermal Mass Flowmeter released Mag-Wheel Flowmeter released |
| 1986 | Mass Flow Controller released Thermal Flowmeter (High Temperature version) released |
| 1987 | In-line type Ultrasonic Flowmeter released Engine Blow-by Gas Measurement System released Distributor agreement with Kistler-Morse of USA |
| 1988 | AM Series Compact V / A Meter released Mass Flowmeter / Controller (High Pressure Version) released Thermal Liquid Meter released |
| 1989 | Clamp-on type Ultrasonic Flowmeter released |
| 1990 | CALTIS (Cargo Level and Temp. Information System) released ITMS (Integrated Tank Management System) released |
| 1991 | Mini-Thermal Flowmeter released |
| 1993 | Torque tube type Displacer Level Transmitter released Hall element based Marine Level Sensor released |
| 1994 | Distributor agreement with McCrometer of USA McCrometer's V-Cone introduced UCUF PFA small size Ultrasonic Flowmeter released |
| 1995 | Distributor agreement with Auxitrol of France Auxitrol's Marine Radar Gauge introduced |
| 1996 | Distributor agreement with MTS of USA MTS's Magnetostrictive Transmitter introduced |
| 1997 | Flow Level Engineering (S.E.A) Pte Ltd, (Joint Venture Co.) established in Singapore |
| 1998 | New President, Dr. T. Sugi inaugurated Company reorganized for the new century Certification of ISO9001 obtained |
| 1999 | TOKYO KEISO KOREA established Production factory established in Taiwan OEM agreement with NORTON PERFORMANCE PLASTICS and NORTON ASTI |
| 2001 | Yokohama Factory renewed and expanded |
| 2002 | Production factory established in Shanghai, China |
| 2004 | Local subsidiaries for sales and maintenance established in Taiwan, Singapore, Thailand, Malaysia and Indonesia |
| 2005 | Local subsidiary company established in Shanghai in China |
| 2007 | Certification of ISO14001 obtained |
| 2009 | Production plant established in Fujian in China Production plant established in Thailand Joint company for production and sales established in Chongqing in China |
| 2010 | Local subsidiary company established in USA |
| 2011 | Okinawa factory established in Okinawa, Japan |
| 2015 | HAKUSAN BUSINESS CENTER established in Yokohama |
| 2017 | Osaka Branch Office established |
| 2018 | New CEO, Mr. Ryoichi Sugi inaugurated |
| 2020 | Renewal of Yokohama Factory. |
