Drilling Oil and Gas Wells, Support Activities for Oil and Gas Operations, Support Activities for Coal Mining, Support Activities for Metal Mining, Support Activities for Nonmetallic Minerals (except Fuels) Mining

Natural Gas Distribution, Water Supply and Irrigation Systems, Sewage Treatment Facilities, Steam and Air-Conditioning Supply, Water and Sewer Line and Related Structures Construction

Support Activities for Oil and Gas Operations, Steam and Air-Conditioning Supply, Ice Cream and Frozen Dessert Manufacturing, Steel Foundries (except Investment), Heating Equipment (except Warm Air Furnaces) Manufacturing

Steam and Air-Conditioning Supply, Air-Conditioning and Warm Air Heating Equipment and Commercial and Industrial Refrigeration Equipmen

Steam and Air-Conditioning Supply, Plumbing, Heating, and Air-Conditioning Contractors, Heating Equipment (except Warm Air Furnaces) Manufacturing, Air-Conditioning and Warm Air Heating Equipment and Commercial and Industrial Refrigeration Equipmen, Air and Gas Compressor Manufacturing

Water Supply and Irrigation Systems, Sewage Treatment Facilities, Steam and Air-Conditioning Supply, Industrial Building Construction, Commercial and Institutional Building Construction

Steam and Air-Conditioning Supply, Plumbing, Heating, and Air-Conditioning Contractors, Air-Conditioning and Warm Air Heating Equipment and Commercial and Industrial Refrigeration Equipmen, Automatic Environmental Control Manufacturing for Residential, Commercial, and Appliance Use, Other Measuring and Controlling Device Manufacturing

Water Supply and Irrigation Systems, Sewage Treatment Facilities, Steam and Air-Conditioning Supply, Water and Sewer Line and Related Structures Construction, Engineering Services

Support Activities for Oil and Gas Operations, Support Activities for Nonmetallic Minerals (except Fuels) Mining, Other Electric Power Generation, Water Supply and Irrigation Systems, Steam and Air-Conditioning Supply

Steam and Air-Conditioning Supply, Warm Air Heating and Air-Conditioning Equipment and Supplies Merchant Wholesalers