Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6176652 | Drilling machine with vacuum suction table | Shih-Chung Chang, Wen-Chih Sung, Li-Na Chang | 2001-01-23 |
| 6152812 | Punching machine for cutting glass | Wen-Chih Sung | 2000-11-28 |