- Advanced Geosciences Inc
- American-Gulf Geophysical Corp
- Ardco Industries Inc
- ASC Scientific
- Besco Geophysical Cable Repair
- Betsy Seisgun Inc
- Bolt Technology Group
- Bolt Technology Group
- C & M Seismograph Equipment Co
- C A Richards & Assoc Inc
- Carson Gravity Meter & Instrmt
- Carson Gravity Meter & Instrmt
- Computer Logging Inc
- DWS Intl Inc
- Eentec
- Fugro Robertson
- Fugro Robertson
- Geo Tech Environmental Equipme
- Geo-Western
- Geo-X Systems Inc
- Geo-X Systems Inc
- Geo-X Systems Inc
- Geomatic
- Geophysical Services & Product
- Geophysical Services & Product
- Geosearches Inc
- Geosonics
- Geoview Manufacturing Inc
- Geoview Manufacturing Inc
- Horiba Crystal Products
- Input 11 Output Inc
- LTI Inc
- LTI Inc
- Maridan USA
- Maridan USA
- Micro-G Solutions Inc
- Pulse Radar Inc
- R T Clark Co
- Seistronics Inc
- Telluric Consulting Svc
- ZLS Corp