Issued Patents 2005
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6959069 | Method for testing subscriber line of private automatic branch exchange using dual-tone multi-frequency signal | — | 2005-10-25 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6959069 | Method for testing subscriber line of private automatic branch exchange using dual-tone multi-frequency signal | — | 2005-10-25 |