Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4699558 | Mobile cargo loader for lifting and transporting building modules and the like | Douglas R. Hagge | 1987-10-13 |
| 4640528 | Torsion-absorbing highway semitrailer | William C. Boyles, Douglas R. Hagge | 1987-02-03 |