| 213112 |
Shot hole drilling, oil and gas field, on a contract basis |
| 213112 |
Skidding of rigs, oil and gas field, on a contract basis |
| 213112 |
Slush pits and cellars, excavation of, on a contract basis |
| 213112 |
Steam cleaning oil and gas wells on a contract basis |
| 213112 |
Stratigraphic drilling, oil and gas field exploration on a contract basis |
| 213112 |
Surveying (except seismographic) oil or gas wells on a contract basis |
| 213112 |
Swabbing oil or gas wells on a contract basis |
| 213112 |
Well casing running, cutting and pulling, oil and gas field on a contract basis |
| 213112 |
Well logging, oil and gas field, on a contract basis |
| 213112 |
Well plugging, oil and gas field, on a contract basis |