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1926	Maruichi Production founded as a bicycle parts production company .
1935	Started producing bicycle steel pipes.
1940	Company name changed to Maruichi Steel Tube Works and separated from its bicycle parts division.
1947	Maruichi Steel Tube Ltd. established.
1956	Osaka Office rearranged and Maruichi Kohan Ltd. founded.
1957	Osaka Plant opened.
1958	Tokyo Office opened. Electric tube welding system imported from Abby Etona Co. of US. Changed from welding system to seem-welding system.
1960	Changed trade name to Maruichi Steel Tube Ltd. Nagoya Office opened.
1961	Tokyo Plant opened.
1962	Company listed 2nd board in the Tokyo and Osaka Stock Exchange.
1964	Company listed 1st board in the Tokyo and Osaka Stock Exchange. Fukuoka Office opened.
1965	Sakai Plant opened.
1966	Nagoya Plant opened (merged into present Nagoya Plant in 1984). Hiroshima Office opened.
1970	Hokkaido Maruichi Steel Tube Ltd. founded. Sapporo Office opened.
1971	Indonesia Steel Tube Works Ltd. (ISTW) founded.
1972	Sakai Pole Plant opened. Osaka office opened.
1973	Tokyo No.2 Plant newly opened.
1974	Shikoku Maruichi Steel Tube Ltd. founded. Kyushu Maruichi Steel Tube Ltd. founded.
1977	Nagoya Second Plant (present Nagoya Plant) opened. Tachibana Industry Co.,Ltd. and Shikoku Maruichi Steel Tube Ltd. merged.
1978	Main office relocated to present address, Kitahorie, Nishi-ku, Osaka. Maruichi American Corporation (MAC) established.
1989	Takuma Plant opened.
1995	Kashima Pole Plant opened. Tokyo No.2 Plant renewal completed.
1998	Sapporo Plant united into Tomakomai Plant under Hokkaido Maruichi Steel Tube Ltd.
2000	Hiroshima Office and warehouse opened.
2001	Annealing facilities built in Takuma Plant.
2002	Tokyo No.2 Plant's new warehouse constructed. Hamamatsu's new warehouse completed.
2003	New warehouse and cutting factory opened in Nagoya Plant.
2004	Kyushu Maruichi Steel Tube Ltd. renewal completed.
2005	New factory opened in Tomakomai Plant of Hokkaido Maruichi Steel Tube Ltd.
2006	New warehouse opened in Nagoya Plant. Maruichi Metal Product(Foshan)Co.,Ltd.(MMP) founded. Sun Steel Corporation joins Maruichi Steel tube Group.
2007	New warehouse building opened in Okayama warehouse. New plant built in Sakai plant. SEIKEI STEEL TUBE CORPORATION joins Maruichi Steel Tube Group.
2008	Leavitt Tube Company, LLC (LTC) joins,and it has become one of subsidiary companies of Maruichi Steel Tube Ltd. Sun Steel Joint Stock Company(Sunsco) has become one of subsidiary companies of Maruichi Steel Tube Ltd. Sakai Plant renewal completed.
2009	MARUICHI KUMA STEEL TUBE PRIVATE LIMITED (KUMA) has become one of subsidiary companies of Maruichi Steel Tube Ltd. Sakai Production Facility of Seikei Steel Pipe Corporation founded. opened. Additional acquisition of stocks in Alpha Metal Co., Ltd.
2010	16"mill built in SUNSCO. Sun Steel (Hanoi) Co., Ltd. founded. J-Spiral Steel Pipe Co., Ltd. joins Maruichi Steel Tube Group.