Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4815586 | Chain scraper conveyor | — | 1989-03-28 |
| 4657387 | Method of and apparatus for the investigation of inaccessible subterranean spaces such as boreholes | Wilhelm Knickmeyer | 1987-04-14 |