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| August 1926 |
Sangoro Seo founded Seo Koatsu Flange Partnership Corp. in Taisho-ku, Osaka City, to produce flange joints. |
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| July 1941 |
The company was reorganized into a joint-stock company. |
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| January 1953 |
The company developed a method for manufacturing fin tubes for heat exchangers (the first company to do so in Japan), and launched a business in the field of heat exchanger manufacturing. |
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| November 1959 |
The company name was changed to Seo Koatsu Kogyo Co., Ltd. |
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| December 1962 |
The Tokyo Office was opened. |
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| May 1964 |
The Mikkaichi Works was inaugurated in Kawachinagano, Osaka Prefecture. |
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| October 1973 |
The Ichikawa Works was inaugurated in Ichikawa-cho, Kanzaki-gun, Hyogo Prefecture. |
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| May 1980 |
The head office was moved to Nishi-ku, Osaka City. |
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| August 1982 |
Wind tunnel testing equipment was installed in the Mikkaichi Works in order to establish a system for R&D related to the performance of fin tubes for heat exchangers. |
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| August 1987 |
Large-scale CAD system was introduced to the Mikkaichi Works in order to modernize design processes. |
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| November 1990 |
A 1500 t hydraulic forging press was introduced to the Ichikawa Works in order to expand and reinforce business in the field of forging. |
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| December 1990 |
The Mikkaichi Works achieved the Welding Works Evaluation Level II as defined by the Japan Power Engineering and Inspection Corporation. |
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| June 1993 |
The Ichikawa Works was authorized to indicate its JIS (Japanese Industrial Standards) accreditation according to JISB2220. |
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September 1996 |
The head office was accredited as a business engaged in Specific Construction Business. |
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| April 1998 |
The Mikkaichi Works obtained, from China's Labor Department, a Safety Quality License based on the Safety Quality Licensing System for Imported Boilers and Pressure Vessels. |
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| September 1998 |
A large-scale 5-side processing machine was introduced to the Ichikawa Works in order to commence three-dimensional processing. |
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| March 2000 |
The Ichikawa and Mikkaichi Factories obtained ISO9001 accreditation. |
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| July 2001 |
A 500 t hydraulic forging press was introduced to the Ichikawa Works. |
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| March 2002 |
The Tokyo Office was moved to Minato-ku, Tokyo. |
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| September 2003 |
The Mikkaichi Works was ASME U Stamp accredited. |
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| July 2004 |
The Mikkaichi Works received product accreditation from the Japan Power Engineering and Inspection Corporation. |
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| September 2006 |
The Kaizuka Works was inaugurated in Kaizuka City, Osaka Prefecture, in order to commence the assembly and manufacture of large-scale heat exchangers. |
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| April 2007 |
- The Ichikawa Works obtained ISO14001 accreditation.
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November 2008 |
The Main Building Office was completed in the Mikkaichi Works. |
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