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4911-01 Electric Companies
4922-98 Natural Gas Transmission
4923-98 Natural Gas Transmission & Distribution
4924-01 Gas Natural
4924-02 Heat Supplying Companies
4925-01 Gas Companies
4925-02 Gas Processors
4925-03 Gas Producers
4931-98 Electric & Other Services Combined
4932-98 Gas and Other Services Combined
4939-01 Power Take-Offs
4939-02 Utilities
4939-03 Utilities Underground Cable Locating Svc
4941-01 Water Dealers
4941-02 Water Companies Utility
4941-03 Water Supply Systems
4941-04 Water Conservation Products & Services
4952-01 Sewage Disposal Systems
4952-02 Sewage Treatment Equipment
4952-03 Sewer Companies-Utility
4953-01 Dumps Rubbish
4953-02 Garbage Collection
4953-03 Landfills Sanitary
4953-04 Waste Disposal
4953-05 Waste Disposal-Hazardous
4953-06 Waste Containers
4953-07 Sanitation Services
4953-08 Sanitation Consultants
4953-10 Refuse Systems
4953-11 Recycling Equipment & Systems
4953-12 Landfills Solid Waste
4953-13 Refuse Disposal Depots & Plants
4953-14 Waste Materials
4953-15 Waste Removal Medical
4959-01 Sweepers Industrial
4959-02 Sweeping Service Power
4959-03 Street Cleaning
4959-04 Oil Spill Clean Up Service
4959-05 Lake & Beach Cleaning & Improvement
4959-99 Sanitary Services Nec
4961-98 Steam and Air Conditioning Supply
4971-01 Hydrologists
4971-02 Irrigation Companies