This category covers establishments engaged primarily in performing geophysical, geological, and other exploration services for oil and gas on a contract or fee basis.

Broadly geologists and geophysicists are involved in the exploration process for oil and gas.

The oil and gas field machinery industry includes field tools, oil derricks, drilling rigs and tools, well logging and surveying equipment, and general gas well and oil field machinery and equipment.

Afimitive federal exploration

He was in the oil and gas exploration business.