Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4813628 | Slack limiter for a magnetic tape cassette | — | 1989-03-21 |
DT
Dale T. Tollefson
Overall (1989): #121,476 of 140,708Top 90%
1
Patents 1989