Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7451757 | Concrete cutter | Frederick A. Ketterhagen, Anthony Mertes, Gary L. Barger | 2008-11-18 |
| D470157 | Concrete cutter frame and cab | Fred Ketterhagen, David J. Rynders | 2003-02-11 |