Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4873970 | Warning device to indicate the state of gases exhaustion of a gas filter retaining dangerous gases | Jurgen Coym, Axel Schubert | 1989-10-17 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4873970 | Warning device to indicate the state of gases exhaustion of a gas filter retaining dangerous gases | Jurgen Coym, Axel Schubert | 1989-10-17 |