Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4831651 | Intermediate amplifier for use in two-wire connections of a dial telephone network and method for the gain control of said amplifier | — | 1989-05-16 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4831651 | Intermediate amplifier for use in two-wire connections of a dial telephone network and method for the gain control of said amplifier | — | 1989-05-16 |