All 4 companies
A–Z by legal name| Company | Registry number | Registered | Status | City |
|---|---|---|---|---|
| CHEMTEK ANALYTICAL SERVICES, INC. | DB033035 | 1993-05-17 | Inactive | — |
| GEOTEK ENGINEERING & TESTING SERVICES, INC. | DB027171 | 1988-03-01 | Active | Sioux Falls |
| GEOTEK ENVIRONMENTAL SERVICES, INC. | DB031525 | 1992-03-11 | Active | SIOUX FALLS |
| IRONWOOD COMPANIES, INC. | FB033745 | 2009-08-24 | Revoked | HAM LAKE |