Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4862425 | Device for acquiring seismic data in a borehole and transmission thereof to a central control and recording system | Jacques Cretin, Jean-Francois Therond | 1989-08-29 |
| 4855732 | System for the transmission of signals between a reception assembly lowered into a well and a central control and recording laboratory | Jacques Cretin | 1989-08-08 |