Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4871027 | Multiple-edge sod cutter for vibratory plow | Edgar K. Lindstrom | 1989-10-03 |
| 4794708 | Trenching machine boom assembly | Philip W. Schroeder, Stephen A. Youngers | 1989-01-03 |