42 Oil prospecting, namely, well logging and testing; oil prospecting; geological prospecting; Exploration and searching of oil and gas; gas exploration, oil field exploration, geophysical exploration for the oil, gas and mining industries; Oil and gas exploration for the purpose of locating, drilling and pumping oil and gas for wholesale supply to refiners and processors and accumulators for refiners and processors; performing diagnostics, monitoring and testing of oil wells, gas wells, drilling rigs, and pump jacks; surveying of oil and gas beds and fields