Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4289431 | Boring tool with floating blades | — | 1981-09-15 |
| 4264246 | Boring tool for boring holes of substantial length | Clemens Lowis | 1981-04-28 |
| 4240770 | Boring tool with a floating knife | — | 1980-12-23 |
| 4195957 | Boring tool with floating double edged knife | Helmut Wittkopp, Lothar Heymanns, Willi Hansen | 1980-04-01 |