Founded
Established Tsurumi Umetate Kumiai(Tsurumi Reclamation Association)
Purchased Electric-Pump Dredger(350ps) from England Started developing Tsurumi-Kawasaki Coastal Industrial Areas(Kanagawa Prefecture, Japan)
Established Tsurumi Marine Works Co., Ltd.
Established Tokyo Bay Marine Works Co., Ltd.
Completed Tsurumi-Kawasaki Coastal Industrial Areas
Changed Corporate Name to TOA Kowan Kogyo Co., Ltd.
Merged with Kouwan Kogyo Co., Ltd.
Listed stocks on the Tokyo Stock Exchange
Built Japan's largest cutter suction dredger, Asia Maru with diesel engine (7,000ps)
Opened International Division and Singapore Office
Received order of the first international project in Singapore
Opened Indonesia Office
Opened the Research and Development Center
Changed the name to TOA Harbour Works Co., Ltd.
(Japanese Corporate Name to TOA Kensetsu Kogyo Co., Ltd.)
Changed English name to TOA CORPORATION
Opened Philippine Office
Opened Viet Nam Office
International Division is certified under ISO9001
Introduced the executive officer system
Operation alliance with Ando Corporation Co., Ltd.
International Division is certified under ISO14001
International Division is certified under OHSAS18001
Opened UAE Office
Established the Corporate Compliance Rules
Opened Sri Lanka Office
Celebrated 100 years anniversary
Established the CSR Promoti