Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4880479 | Cold drawn free-machining resulfurized and rephosphorized steel bars having controlled mechanical properties and controlled machinability | Stephen P. Birman, Richard L. Thompson | 1989-11-14 |
| 4799251 | ESS equipment testing device | Michael Tolson | 1989-01-17 |