Issued Patents 1982
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4362489 | Expandable mandrel apparatus for manufacturing smooth-lined corrugated pipe | — | 1982-12-07 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4362489 | Expandable mandrel apparatus for manufacturing smooth-lined corrugated pipe | — | 1982-12-07 |