Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4844047 | Process for sawing crystal rods or blocks into thin wafers | Gerhard Brehm, Karlheinz Langsdorf, Johann Glas | 1989-07-04 |
| 4811722 | Process for sharpening cutting-off tools and cutting-off process | Gerhard Brehm | 1989-03-14 |