Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4843597 | System for marine seismic exploration | Dag K. T. Gjessing, Jens Hjelmstad | 1989-06-27 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4843597 | System for marine seismic exploration | Dag K. T. Gjessing, Jens Hjelmstad | 1989-06-27 |