| April 1940 |
Started manufacturing and sales of acetylene gas welded steel pipes for bicycles in Yokosuka-machi, Chita District, Aichi Prefecture (currently Tokai city)
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| January 1952 |
Established Okajima Pipe Co., Ltd. with 1 million yen in capital
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| August 1962 |
Electric resistance high frequency induction welding made by American company Summer Tool Co., Ltd.
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| December 1968 |
Purchased 25,000 m² of land in Higashiura-cho, Chita-gun, Aichi Prefecture, built Building No. 3 and 4 (3,500 m²) of Higashiura No. 2 Factory, and ran five pipe-making machines and two drawing machines
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| January 1969 |
Imported an automated drawing machine made by West German company Kieserling.
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| May 1972 |
Built Building No. 2 (1,700 m²) of Factory No. 2 and added three pipe-making machines
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| March 1980 |
Built Building No. 1 (2,200 m²) of Factory No. 3
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| January 1982 |
Started production of Pipe In Coil (PIC)
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| October 1982 |
Installed an ERW pipe-making machine (F1)
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| August 1983 |
Expanded Building No. 1 (1,400 m²) of Factory No. 2 and built Office No. 2 (200 m²)
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| November 1985 |
Built Building No. 2 (1,513 m²) of Factory No. 3
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| November 1986 |
Built an employee assembly hall (OP Assembly Hall) (946 m²)
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| September 1987 |
Installed an ERW pipe-making machine (F2)
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| September 1988 |
Installed a dedicated pipe-making machine for high nickel steel and stainless steel
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| March 1989 |
Established Top Tube Manufacturing Co., Ltd. in Thailand
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| October 1990 |
Installed a small-diameter thin-walled PIC pipe-making machine (F4)
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| May 1991 |
Built a humidified multi-level automated warehouse (1,300 m², 1,400-ton capacity)
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| July 1992 |
Installed a pipe-making machine dedicated to stainless steel (S2)
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| April 1993 |
Built a dormitory for single employees (Green Heights)
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| January 1994 |
Installed a small-diameter, thin-walled dedicated pipe-making machine built by Italian company CSM (S1)
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| April 1997 |
Built Factory No. 1 (4,300 m²) and started commercial operation of a private power generator (1,950 kW)
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| December 1998 |
Installed a small-diameter, thin-walled dedicated pipe-making machine built by Italian company CSM (S4)
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| January 2002 |
Received the 35th Medium and Small Business Research Institute Award (currently the Good Company Award) and Special Honorable Mention Award
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| November 2002 |
Installed an ERW pipe-making machine (F10)
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| October 2003 |
Installed a pipe-making machine dedicated to stainless steel (S5)
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| December 2003 |
Higashiura Factory acquired ISO 9001 certification
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| August 2004 |
Installed a small-diameter, thin-walled dedicated pipe-making machine built by Italian company CSM (S6)
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| June 2005 |
Installed an ERW pipe-making machine (F11)
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| April 2006 |
Selected as one of “300 Energetic Manufacturing SMEs” by the Ministry of Economy, Trade, and Industry
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| October 2007 |
Headquarters and Higashiura Factory acquired ISO 14001 certification
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| April 2008 |
Updated the anti-oxidation annealing furnace
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| January 2009 |
Built a new front gate and employee parking lot at the Higashiura Factory
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| September 2010 |
Built Factory No. 4 (3600 m²) and merged OFF-LINE processes
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| November 2013 |
Established PT. Top Tube Indonesia in Indonesia
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| February 2016 |
Installed an ERW pipe-making machine (F12)
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| June 2018 |
Installed a laser welding pipe-making machine (S7)
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| October 2018 |
Installed Bright annealing furnace No. 2
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| March 2020 |
Installed an in-house cutting machine
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| October 2021 |
Expanded the 3rd factory (1,187㎡) and set up a welfare facility (OP hall) on the 2nd and 3rd floors
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