Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4838075 | Method and a fastener for closing and sealing pipes subjected to internal pressure | Pawel Friedrich, Wieslaw Placzek, Leszek Mynarz, Krzysztof Karpinski, Jerzy Gaszewski | 1989-06-13 |