|August, 1905||Founded as Tokyo Tsukishima Kikai Seisakusho.|
|May, 1917||Changed to a stock company and named Tsukishima Kikai Co., Ltd.|
|December, 1937||The company merged with Dai-ni Tsukishima Kikai Co., Ltd. (former Tsurumi Factory), which was located in Tsurumi ward, Yokohama City.|
|May, 1949||The company's shares were listed on the Tokyo Stock Exchange (listed in the First Section in October, 1961).|
|October, 1949||The Osaka satellite office was opened (current Osaka Sales Branch Office).|
|October, 1961||The company's shares were listed on the Second Section of the Osaka Securities Exchange (listed in the First Section in November, 1966).|
|October, 1961||Laboratory was opened in Chuo ward, Tokyo.|
|April, 1971||The pollution control-related equipment operation and management division was spun off and a subsidiary, Tsukishima Maintenance Co., Ltd., was founded.|
|March, 1974||Company was accredited by Minister of Construction (special-48), No. 3484, due to changes in the Construction Industry Act.|
|January, 1976||The Ichikawa Factory was opened.|
|April, 1979||The construction work division was spun off and a subsidiary, Tsukishima Plant Construction Co., Ltd., was founded.|
|April, 1979||The design, manufacturing, and sales divisions of sorting machine, attritor, and metal work machinery and instruments were spun off and Tsukishima Machine Sales Co., Ltd. was founded.|
|December, 1985||The Tsurumi Factory was closed due to consolidation of production systems.|
|November, 1990||The laboratory was relocated and newly opened in Ichikawa City, Chiba.|
|February, 1991||Tsukishima Engineering Malaysia Sdn. Bhd. was founded in Malaysia as a local business office.|
|April, 1993||TSK Engineering (Thailand) Co., Ltd. was founded in Thailand as a local business office.|
|November, 1994||TSK Engineering Taiwan Co., Ltd. was founded in Taiwan as a local business office.|
|December, 1998||The company acquired 20% of total issued shares of Kanuma Kankyo-bika Center (current SUN ECO THERMAL Co., Ltd.as a consolidated subsidiary), providing the company's entrance into the waste-disposal industry.|
|October, 2000||The Environment Process Development Center was opened in Ichikawa city, Chiba.|
|November, 2000||Tsukishima Maintenance Co., Ltd. and Tsukishima Plant Construction Co., Ltd. merged to form Tsukishima Techno Maintenance Service Co., Ltd. (currently a consolidated subsidiary).|
|December, 2001||The manufacturing division was spun off and a subsidiary, Tsukishima Techno Machinery Co., Ltd., was founded.|
|March, 2005||The company acquired 74.6% of total issued shares of Nittetu Chemical Engineering Ltd. (current Tsukishima Kankyo Engineering Ltd.), making it a consolidated subsidiary and reinforcing the company's position in the incineration-related industry.|
|August, 2005||Tsukishima Techno Machinery Co., Ltd. and former Tsukishima Machine Sales Co., Ltd. were merged to enhance and reinforce the company's equipment service business; Tsukishima Techno Machinery Co., Ltd. was the surviving company (currently a consolidated subsidiary).|
|April, 2006||Samukawa Water Service Co., Ltd. (currently a consolidated subsidiary), which was founded through the investment of Tsukishima Techno Maintenance Service Co., Ltd., etc., was fully equipped and developed, and started operation on the Samukawa Water Purification Plant Drainage special business of the Public Enterprises Agency of Kanagawa Prefecture, pursuant to the Act on Promotion of Private Finance Initiative (PFI Act).|
|December, 2008||The company merged with Tsukishima Fudosan Co., Ltd., a non-consolidated company.|
|March, 2011||TSK Engineering China Co., Ltd. was founded in China as a local business office.|
|July, 2012||Tsukishima Techno Solution Co., Ltd. acquired the industrial machinery business from Tsukishima Techno Machinery Co., Ltd. and changed its name to Tsukishima Machine Sales Co., Ltd.
Tsukishima Kikai Co., Ltd. merged with Tsukishima Techno Machinery Co., Ltd. in an absorption type merger.
|December, 2013||Headquarters were relocated to the current location.
The Environment Process Development Center was closed and that function was integrated with Ichikawa Research & Development Center.
|October, 2014||The company acquired the entire issued share capital of DAIDO CHEMICAL ENGINEERING CORP., making it a subsidiary.|
|December, 2014||The company acquired 83.33% share capital of BOKELA GmbH(incorporated in Germany), making it a subsidiary.|
|July, 2017||The company acquired the issued share capital of SANSHIN KOGYO Co.,Ltd., making it a subsidiary.|
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