Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4581488 | Last number redial device | Robert B. Lawson, Robert Corless, John Kardash | 1986-04-08 |
| 4508939 | Last number redial device | Robert B. Lawson, Robert Corless, John Kardash | 1985-04-02 |