Company profile

Let us tell you about KOJIMAGUMI.



1919 Jun. Establish in Ueno-village, Chita-county, Aichi (Current Nawa-machi, Tokai-city)
1941 Dec. Reorganize (Capital 198,000 yen)
1948 Apr. Start dredging 
(Horikawa river dredging)
1954 Mar. Build a wooden grab dredger 
(1 RYOSEI MARU)
1957 Sep. Move office to current location
1959 Mar. Build a steel grab dredger
(10 RYOSEI MARU)
1963 Mar. Increase the capital to 18,000,000 yen
1967 Apr. Open Tokyo branch
1970 Jun. Build an anchorless grab dredger 
(61 RYOSEI MARU)
1975 Mar. Patent anchorless moving equipment 
(2 Spuds)
Nov. Increase the capital to 36,000,000 yen
1984 Jul. Open Osaka branch
1985 Sep. Build a hydraulic counter weight balance system grab dredger 
(261 RYOSEI MARU)
1988 May. Increase the capital to 80,800,000 yen
1993 Jul. Build an air pressure transfer vessel (Air pressure vessel) 
(AP 1000 RYOSEI MARU)
1995 Jul. Build a mega grab dredger 
(200m3 Grab bucket) TOSHO
2000 May. Build a second mega grab dredger (200m3 Grab bucket) GOSHO
2004 Aug. GOSHO & TOSHO complete Nakayama channel dredging
2008 Oct. First overseas dredging project in Saudi Arabia (GOSHO)
2012 Apr. First African dredging project in Republic of South Africa (TOSHO)
Sep. Increase the capital to 90,000,000 yen
2014 Jun. First South East Asian dredging project in Singapore (661 RYOSEI MARU)