Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4806958 | Cassette/machine optically coupled interface | Ensley E. Townsend | 1989-02-21 |
| 4806960 | Cassette information controller and memory | Ensley E. Townsend, Michael W. LaCourt | 1989-02-21 |