Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4865079 | High pressure hydraulic flow control valve | Paul H. Martin, John C. Martin | 1989-09-12 |
| 4825909 | High pressure hydraulic flow control valve | Paul H. Martin, John C. Martin | 1989-05-02 |