Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4874250 | Apparatus for examination of heats of transformation of material samples | — | 1989-10-17 |
| 4818489 | Device for sampling breath air at the workplace | Bruno Kolb, Gottfried Machata | 1989-04-04 |