| 1954 | Established Tong Xing processing factory in Chiayi. |
| 1969 | Renamed Tong Lung Metal Industry Co., LTD. – successfully producing cylindrical door locks. |
| 1976 | Purchased precision instruments and Implemented production QC –
obtained license to export locksets. |
| 1977 | Obtained ANSI Grade 3 certification for residential Lockset. |
| 1980 – 1983 | Launched EZSET Brand - Developed tubular locksets - Imported equipment for mass production. |
| 1988 – 1990 | Established Door Closer factory – Acquired Posse lock company – Introduced corp ID system |
| 1994 – 1995 | Listed on Taiwan Stock Exchange – Obtained ISO-9002 certificate. |
