Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4298969 | Method and apparatus for testing the impedances of geophone channels | — | 1981-11-03 |
| 4276619 | Impedance and common mode rejection testing of a multi-channel seismic data gathering apparatus | — | 1981-06-30 |
| 4184144 | Measurement and control of the output force of a seismic vibrator | — | 1980-01-15 |