Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6272775 | Rear dumping dragline bucket and rigging system | Don F. Schmidt, DuWayne A. Marthaller, Karl Lemmerman, Dean Bray, R. Steven Metzger | 2001-08-14 |
| 4571225 | Sheave assembly | Paul E. Barbie | 1986-02-18 |