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NAICS Code(s): 211111 (Crude Petroleum and Natural Gas Extraction)
The extraction of petroleum is the process by which usable petroleum is extracted and removed from the earth.
Petroleum safety is the absence of injury or illness when using or exposed to petroleum or during its extraction from the ground.
Desalination is the extraction of sodium chloride to obtain drinking water, extraction of salt from petroleum, from water wastes etc.
drilling comes to mind