Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4658851 | Reversing valve construction and method of making the same | Rudolf Koch | 1987-04-21 |
| 4564045 | Reversing valve construction and method of making the same | Rudolf Koch | 1986-01-14 |