Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4852158 | Telephone system allowing hold releasing request from central office line | Masayuki Tsurusaki, Tamotsu Wakabayashi, Hiroshi Mano | 1989-07-25 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4852158 | Telephone system allowing hold releasing request from central office line | Masayuki Tsurusaki, Tamotsu Wakabayashi, Hiroshi Mano | 1989-07-25 |