| 1957 |
Founded Showa Associated Architects, Inc. |
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| 1958 |
Relocating office to Awaza District, Nishi-ku, Osaka |
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| 1962 |
Changing Corporate Name to Showa Architects, Inc. |
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| 1965 |
Adding Water/Sewer Engineering in Civil Works. |
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| 1967 |
Relocating office to Shin-machi District, Nishi-ku, Osaka |
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| 1971 |
Opening Kobe Office |
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| 1972 |
Changing corporate name to Showa Sekkei, Inc. |
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| 1973 |
Opening Tokyo Office |
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| 1983 |
Introduction of TQC |
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| 1985 |
Introduction of CAD System |
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| 1987 |
Opening Kyushu Office |
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| 1995 |
Establishing Hanshin-Awaji Earthquake Disaster Investigation Committee |
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| 1997 |
Relocating Headquarters to Benten District, Minato-ku, Osaka |
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| 1999 |
Registration of ISO9001 Certification (Osaka,Tokyo Office) |
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| 2000 |
Registration of ISO14001 Certification (Osaka,Tokyo Office) |
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| 2010 |
Relocating Headquarters to Toyosaki District, Kita-ku, Osaka |
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| 2012 |
Opening Sendai Office |
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| 2013 |
Relocating Tokyo Office to Shibaura District, Minato-ku, Tokyo |
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(As of November 1, 2024) 