| 1937-07 |
Founded as Showa Manufacturing in July 1937 |
| 1937-07 |
Founded as Showa Seisakusho. |
| 1954 |
Introducing the history of our company since its establishment in 1954. |
| 1954-12 |
In December 1954, 'Maezawa Valve Industry Co., Ltd. (now Maezawa Industries Co., Ltd.)' was established, and the resin division was spun off and became 'Hard Envi Industry Co., Ltd.' |
| 1954-12 |
The resin division of "Maezawa Valve Industry Co., Ltd. (now Maezawa Industry Co., Ltd.)" separated and established "Hard Envi Industry Co., Ltd.". |
| 1961-07 |
Changed the company name to 'Maezawa Kasei Industries Co., Ltd.' in July 1961 |
| 1961-07 |
Changed company name to "Maezawa Kasei Industry Co., Ltd.". |
| 1964-09 |
Announced resin-made water meter boxes and water stop boxes in September 1964 |
| 1964-09 |
Announced resin water meter boxes and water stop boxes. |
| 1965-09 |
Launched water valve columns in September 1965 |
| 1965-09 |
Launched water tap posts. |
| 1969-11 |
Established the Tsumagoi Factory in November 1969 |
| 1969-11 |
Established the Wife-numa Factory. |
| 1980-05 |
Launched Maezawa VU fittings in May 1980 |
| 1980-05 |
Launched Maezawa VU fittings. |
| 1982-08 |
Launched invert fittings (now Vinimas System) in August 1982 |
| 1982-08 |
Launched the Invert Fittings (now BiniMass System). |
| 1993-04 |
Launched vinyl chloride small manholes 'Vinihole System' in April 1993 |
| 1993-04 |
Launched vinyl chloride small manholes "BiniHole System". |
| 1993-09 |
Went public on the over-the-counter market in September 1993 |
| 1993-09 |
Listed on the over-the-counter market. |
| 1999-03 |
Obtained ISO 9001 quality management system certification in March 1999 |
| 1999-03 |
Obtained certification for the quality management system "ISO 9001". |
| 2000-02 |
Listed on the Second Section of the Tokyo Stock Exchange in February 2000 |
| 2000-02 |
Listed on the Second Section of the Tokyo Stock Exchange |
| 2001-01 |
Launched foundation through sleeves in January 2001 |
| 2001-01 |
Launched a through-wall sleeve |
| 2001-03 |
Listed on the First Section of the Tokyo Stock Exchange in March 2001 |
| 2001-03 |
Listed on the First Section of the Tokyo Stock Exchange |
| 2002-03 |
Completed Tsumagoi Second Factory in March 2002 |
| 2002-03 |
Completion of the Second Factory in妻沼 |
| 2002-07 |
Launched Vinyl Header in July 2002 |
| 2002-07 |
Launched a vinyl header |
| 2002-10 |
Obtained ISO 14001 environmental management system certification in October 2002 |
| 2002-10 |
Certified for Environmental Management System "ISO 14001" |
| 2005-09 |
Completed the second phase of Tsumagoi Second Factory and started operation in September 2005. Simultaneously, the Todako Factory was closed, and the Kumagaya First and Second Factories began operation. |
| 2005-09 |
Completion of the second phase expansion of the妻沼 second factory, closure of the戸田 factory, start of operation at熊谷 first and second factories |
| 2008-01 |
In January 2008, it became a consolidated subsidiary of "Kyowa Seikei Co., Ltd. (now Niigata Seikei Co., Ltd.)". |
| 2008-01 |
Made Kyowa Molding Co., Ltd. (now Niigata Molding Co., Ltd.) a consolidated subsidiary |
| 2010-05 |
In May 2011, established a local joint venture in China, "Zhejiang Qianze Jiasheng Drainage Materials Co., Ltd.". |
| 2011-05 |
Established a local joint venture in China, Zhejiang Qianze Jiasheng Drainage Materials Co., Ltd. |
| 2013-02 |
In February 2013, made "Niigata Seikei Co., Ltd." a 100% subsidiary. |
| 2013-02 |
Made Niigata Molding Co., Ltd. a 100% subsidiary |
| 2015-11 |
In November 2015, completed the construction of a new building at Kumagaya First Factory and started operation. |
| 2015-11 |
Construction completion and start of operation of the new building at熊谷 first factory |
| 2016-06 |
In June 2016, developed and launched the resin single-pipe drainage system "ViniCore". |
| 2016-06 |
Developed and launched a resin-made single-pipe drainage system "Vinicoa" |
| 2018-02 |
In February 2018, transferred shares of the Chinese joint venture "Zhejiang Qianze Jiasheng Drainage Materials Co., Ltd." and withdrew. |
| 2018-02 |
Transferred shares of the Chinese joint venture Zhejiang Qianze Jiasheng Drainage Materials Co., Ltd. and withdrew |
| 2020-04 |
Transitioned to the Prime Market of the Tokyo Stock Exchange |
| 2022-04 |
In April 2022, transitioned to the Tokyo Stock Exchange Prime Market. |
| 2022-10 |
In October 2022, made "Joyo Waterworks Industry Co., Ltd." a consolidated subsidiary. |
| 2022-10 |
Made Joyo Waterworks Industry Co., Ltd. a consolidated subsidiary |
| 2026-04 |
In April 2026, was excluded from the consolidated subsidiaries due to the transfer of shares of "Niigata Seikei Co., Ltd.". |
| 2026-04 |
Excluded from consolidated subsidiaries due to share transfer of Niigata Molding Co., Ltd. |
| 2026-06 |
Became a wholly owned subsidiary of Maezawa Holdings Co., Ltd. through a joint share transfer with Maezawa Industries Co., Ltd. |
