Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4888652 | Communications recorder having a unique identification code and secure method and apparatus for changing same | — | 1989-12-19 |
| 4851937 | Apparatus for securing access to a communications recorder | — | 1989-07-25 |
| 4827461 | Universal telecommunications audio coupling device | — | 1989-05-02 |
| 4811131 | Method and apparatus for scanning and recovering information from a record medium | Raymond F. Freer | 1989-03-07 |