Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4821425 | Cylindrical surface profile and diameter measuring tool and method | James R. Currie, Ralph R. Kissel, Charles E. Oliver, Earnest C. Smith, John W. Redmon, Jr. +1 more | 1989-04-18 |
| 4815702 | Gate valve with poppet closure | — | 1989-03-28 |