Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4611787 | Efficient lightweight hoist with multiple-cable-size traction and safety systems | Marvin M. May, Robert C. Billings, Jeffrey T. Bayorgeon | 1986-09-16 |
| 4555091 | Efficient lightweight hoist with multiple-cable-size traction and safety systems | Marvin M. May, Robert C. Billings, Jeffrey T. Bayorgeon | 1985-11-26 |