Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7726663 | Self-tightening drill chuck | Hans-Dieter Mack, Peter Schenk | 2010-06-01 |
| 6726176 | Stepped butterfly valve | — | 2004-04-27 |
| 4862788 | Valve positioning device | — | 1989-09-05 |