History
| Apr. 1982 | Founded as Sinsin Co., Ltd. in No.27, 1114, Takayanagi, Shonanmachi, |
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| Jul. 1983 | The head office was moved to No.1, 1139, Takayanagi, Shonanmachi, |
| Nov. 1983 | The capital was increased to 10,000,000Yen |
| Apr. 1987 | The head office was moved to No.8, 477, Takayanagi, Shonanmachi, |
| Dec. 1994 | The Company’s name was changed to SIM. |
| Apr. 1995 | Second warehouse and factory was set at No.1, 1143, Takayanagi, |
| Jun. 2001 | All factories were moved to Hiratsuka Shiroi-City Chiba (Current Head Office,Hiratsuka-Factory) |
| Nov. 2006 | New office building was completed. The latest machines were brought in>> |
| Jul. 2008 | New Nauchi factory was completed at 362-1, Nauchi, Shiroi, Chiba. |
| Oct. 2008 | ISO 14001 certification |
| Oct. 2009 | ISO 9001 certification |
| Feb. 2011 | Ordinary Construction Business License |
| Nov. 2011 | The capital was increased to 20,000,000 Yen. |
| Nov. 2011 | Steel Fabrication Certification (Grade R) |
| Feb. 2012 | Special Construction Business License |
| Apr. 2017 | established Nauchi-Komagata-Factory |
| Mar. 2018 | The capital was increased to 30,000,000 Yen. |
| Jun. 2019 | Steel Fabrication Certification (Grade M) |