Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4869159 | Built-up and telescopic tea-making device | Chung-Yi Yan | 1989-09-26 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4869159 | Built-up and telescopic tea-making device | Chung-Yi Yan | 1989-09-26 |