Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5020612 | Wire line core drilling apparatus | — | 1991-06-04 |
| 4305462 | Apparatus for positioning deflection wedges | Wulf Eilers, Zdenek L. Figar, Johan G. Grabe, Stanley J. Landers | 1981-12-15 |