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- 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 Promotion Committee and the CSR Promotion Department
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