| 1868 - 1912 (Meiji Era) |
Usu Murayama, the father of founder Hideyuki Murayama, founded "Sue Megusuri" in Sue-machi, Fukuoka, and began manufacturing and sales. |
| January 1917 (Taisho 6) |
Hideyuki Murayama founded the store, "Taiyo Shoten", and began manufacturing and sales of home remedies. |
| November 1924 (Taisho 13) |
Renamed company to Tenyosya Limited Partership and moved to Fukuoka City. |
| January 1929 (Showa 4) |
Began manufacturing and sales of "Peptone Iron", a blood cellular component. |
| July 1947 (Showa 22) |
After WWII, established Tenyosya Pharmaceutical Manufacturing Business Corporation and restarted operations. |
| January 1971 (Showa 46) |
Joined MUROMACHI-GROUP. |
| June 1971 (Showa 46) |
Began pharmaceutical business operations. |
| December 1981 (Showa 56) |
Began manufacturing of health foods. |
| March 1988 (Showa 63) |
Began the manufacture of chemicals and electronic materials. |
| April 1990 (Heisei 2) |
Began manufacturing ion exchange resins. |
| January 1994 (Heisei 6) |
Began manufacturing of ultra-pure water related projects. |
| November 1996 (Heisei 8) |
Moved headquarters and industrial plant to Omuta-shi, Fukuoka. |
| September 1998 (Heisei 10) |
Company changed name to Muromachi Chemicals Inc. |
| October 1999 (Heisei 11) |
Obtained ISO 9001 certification. |
| April 2003 (Heisei 15) |
Established logistics warehouse adjacent to the head office. |
| June 2005 (Heisei 17) |
Established Tenyosya Pharmaceutical Co., Ltd. |
| September 2005 (Heisei 17) |
Established the Tokyo Branch. |
| June 2006 (Heisei 18) |
Health food manufacturing plant began operations. |
| November 2006 (Heisei 18) |
Surface treatment plant began operations. |
| April 2009 (Heisei 21) |
Began commercial sales. |
| August 2009 (Heisei 21) |
Completion of new office. |
| March 2010 (Heisei 22) |
Compound plant began operations. |
| December 2010 (Heisei 22) |
Established Muromachi (Shanghai) Trading Co., Ltd. |
| February 2011 (Heisei 23) |
Completion of second medical product plant. |
Headquarters and Industrial Plant