Designated as supervisory factory of the former Japanese navy
1947October 25
Incorporated as Tsurumi-Seiki Kosakusho Co., Ltd.
Main services and products
1928
Improved and began domestic production of Sigsby motorized depth sounder (winch)
First motorized depth sounder (winch)
1930
Depth gauge No. 2 pulley - Honda tide gauge
Depth gauge No. 2 pulley
1931
Water sampler, Iwamiya bottom sampler, etc.
1949
Ship log
Company History
1954
Began offering oceanic water quality observation technologies
Established Iwamiya's Laboratory
1967
Masao Iwamiya conferred the Order of the Sacred Treasure, 4th Class
1969
Tsurumi-Seiki began technical partnership with Sippican and started domestic production of XBT
1971
Company name changed to Tsurumi-Seiki Co., Ltd.
Main services and products
1951
Self-recording current meter No. 2
1955
Mechanical Bathy Thermograph (MBT) Umitaka-Maru 3000 m hydraulic winch
MBT
1962
Salinity meter E-2
1968
MTCM-3 (magnetic tape record current meter)
1969
eXpendable Bathy Thermograph (XBT) deployed water temperature meter
XBT
Company History
1975
Hiroshi Iwamiya appointed President and Masao Iwamiya appointed Chairman
1977
Began offering water quality observation technologies for terrestrial use, starting with the Miho Dam construction project
1978
Company celebrated 50th anniversary
1981
T.S.K America established in Seattle, participated in Shinkai 2000 project
1987
Shirakawa Plant constructed
1989
Participated in Shinkai 6500 project
Shinkai 6500(conceptual image)
1990
Presented Prime Minister's Award for Shinkai 6500
1995
T.S.K Service Center established
1996
Participated in XCTD competition with Sippican off the coast of Bermuda; Tsurumi-Seiki XCTD certified as world standard
Main services and products
1981
Microwave wave height meter
1985
Autolauncher
1997
eXpendable Conductivity, Temperature and Depth (XCTD) deployed salinity, water temperature sensor
XCTD
Company History
1999
ISO 9001 certification
2003
Began offering atmospheric observation technologies at Chichijima Island
2005
Service Center celebrated 10th anniversary
2006
Selected by the Ministry of Economy, Trade and Industry for the Vibrant GENKI Small and Medium Manufacturing Enterprises 300
2007
Hiroshi Iwamiya conferred the Order of the Rising Sun
Second President Hiroshi Iwamiya
2010
Michihiko Tachikawa appointed President and Hiroshi Iwamiya appointed Chairman
T.S.K Liaison Office established in India
Pressure testing facility constructed
2011
Selected as Yokohama Chizai Mirai Enterprise
2018
Company celebrated 90th anniversary
Main services and products
2002
NINJA profiling float (2,000 m)
2003
Radiosonde atmospheric observation system
2004
Direct Drive Volume Control (DDVC) winch
DDVC winch
2005
Airborne eXpendable Conductivity, Temperature and Depth (AXCTD) deployed salinity, water temperature sensor for aircraft
Company History
Main services and products
