Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4367898 | Excavating machines for tunneling with template fixed to boom | Robert H. Higgs | 1983-01-11 |
| 4209199 | Mineral mining machines | John T. Nicholls, Robert H. Higgs | 1980-06-24 |