| Feb. 1994 |
incorporated as Tokyo Trading Co., Ltd |
| Mar. 2000 |
changed company structure, and capital increased from 3 million Yen to 10 million Yen |
| May 2003 |
capital increased to 30 million Yen |
| Jun. 2003 |
founded QHD China Star subsidiary |
| Aug. 2003 |
capital increased to 100 million Yen |
| Nov. 2003 |
founded Liaoning Dongyu Petropipe subsidiary |
| Dec. 2003 |
founded Julong Petromaterials,Inc. (US) |
| Apr. 2005 |
founded Yangzhou Tongya subsidiary |
| May 2005 |
founded First Machinary (Huabei) Petro Pipe Co. |
| Sep. 2005 |
issued corporate debenture bonds at first time |
| Oct. 2005 |
founded Japan Petropipe Co. ltd. |
| Dec. 2005 |
founded Cangzhou China Star Co. subsidiary |
| Dec. 2005 |
founed Liaoning Shenyu Petropipe Co. subsidiary |
| Dec. 2005 |
corporate name changed to PetroMaterials Co. |
| Mar. 2006 |
issued corporate debenture bonds on second time |
| Mar. 2006 |
isuued new stocks at first time, raised capital of 510 million Yen, registed capital increased to 355 million Yen, and reserved capital increased to 255 million Yen |
| Jul. 2006 |
isuued new stocks on second time, registed capital increased to 1.363 billion Yen |
| Jan. 2007 |
isuued new stocks on third time, registed capital increased to 2,310.8 Million Yen, and reserved capital increased to 1,202.8 Million Yen |
