IC 039. US 100 105. G & S: Storage and distribution of electricity, power, air, heat, cold, gas, oil and other fuels
IC 040. US 100 103 106. G & S: Processing and refining of oil, gas and other fuels for the production of energy, electricity, cold, heat, air and water; refining of oil, gas and other fuels
IC 042. US 100 101. G & S: Analysis for gas-field and oil-field exploitation; gas-well and oil-well testing; gas-field and oil-field surveys; gas and oil prospecting; analytical services relating to the development of oil and gas fields
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