Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4817671 | High pressure mechanical plug device | Dale K. Nelson | 1989-04-04 |
| D300350 | Expansible sealing plug for pipelines and the like | — | 1989-03-21 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4817671 | High pressure mechanical plug device | Dale K. Nelson | 1989-04-04 |
| D300350 | Expansible sealing plug for pipelines and the like | — | 1989-03-21 |