Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5325926 | Reversible casing for a down-the-hole percussive apparatus | Leland H. Lyon | 1994-07-05 |
| 5301761 | Pressure reversing valve for a fluid-actuated, percussive drilling apparatus | Chuen-Cheng Fu | 1994-04-12 |