Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4646853 | Shaft boring machine and method | David B. Sugden, David T. Cass, Peter B. Dowden | 1987-03-03 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4646853 | Shaft boring machine and method | David B. Sugden, David T. Cass, Peter B. Dowden | 1987-03-03 |