Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4848463 | Surface read-out tester valve and probe | Burchus O. Barrington | 1989-07-18 |
| 4817723 | Apparatus for retaining axial mandrel movement relative to a cylindrical housing | — | 1989-04-04 |