Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4222795 | Pipe cutting apparatus and method | James Robert GRILL, Jack H. Keller | 1980-09-16 |
| 4219370 | Apparatus and method for cutting and beveling pipe ends | James Robert GRILL, Jack H. Keller | 1980-08-26 |