Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4876780 | Double wall vacuum tubing and method of manufacture | Charles R. Stahl, Christian W. Knudsen | 1989-10-31 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4876780 | Double wall vacuum tubing and method of manufacture | Charles R. Stahl, Christian W. Knudsen | 1989-10-31 |