Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5433388 | Usage application of a machine for recycling gypsum plaster board | Harri Hirz | 1995-07-18 |
| 5413284 | Method of and apparatus for treating plasterboard-production scrap | Harri Hirz | 1995-05-09 |