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40-- Railroad Transportation

    401- Railroads
      4011 Line Haul Operating Railroads
      4013 Railroad Switching & Terminal Establishments

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41-- Local And Suburban Transit And Interurban Highway Passenger

    411- Local And Suburban Passenger Transportation
      4111 Local & Suburban Transit
      4111a Airport Transportation Services
      4119 Local Passenger Transportation
      4119a Ambulance Services
      4119b Limousine Services

    412- Taxicabs
      4121 Taxicab Companies

    413- Intercity And Rural Bus Transportation
      4131 Intercity & Rural Bus Transportation

    414- Bus Charter Service
      4141 Local Bus Charter Services
      4142 Bus Charter Services Except Local

    415- School Buses
      4151 School Bus Services

    417- Terminal And Service Facilities For Motor Vehicle Passenger
      4173 Terminal & Service Facilities For Motor Vehicle Passenger Transportin
      4173a Bus Terminal Services
      4173b Motor Vehicle Services

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42-- Motor Freight Transportation And Warehousing

    421- Trucking And Courier Services, Except Air
      4212 Local Trucking Without Storage
      4212a Local Delivery Services
      4212b Cartage & Express Service Local
      4213 Trucking Except Local
      4213a Mobile Home Transporting Companies
      4213b Contract Haulers Except Local
      4213c Heavy Hauling Trucking
      4213k Horse Transporting
      4213m Refrigerated Trucking
      4214 Local Trucking With Storage
      4215 Courier Services Except By Air
      4215a Messenger Services

    422- Public Warehousing And Storage
      4221 Farm Product Warehousing & Storage
      4221a Grain Elevators
      4221c Tobacco Warehouses
      4221f Commodity Warehouses
      4222 Refrigerated Warehousing & Storage
      4222a Cold Storage Warehouses
      4222b Frozen Food Lockers
      4225 General Warehouses
      4225d Rental & Self Service Warehouses
      4226 Special Warehousing & Storage
      4226a Private & Public Household Warehouses
      4226b Camping & Travel Trailer Storage
      4226c Recreational Vehicle Storage
      4226e Trailer Storage

    423- Terminal And Joint Terminal Maintenance Facilities For Motor Freight
      4231 Terminal Maintenance Facilities For Motor Freight Transportation

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43-- United States Postal Service

    431- United States Postal Service
      4311 Government Postal Service

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44-- Water Transportation

    4412 Deep Sea Foreign Transportation Of Freight
      4412b Containerized Freight Service

    442- Deep Sea Domestic Transportation Of Freight
      4424 Deep Sea Domestic Transportation Of Freight
      4424a Intercoastal Transportation
      4424b Coastwise Transportation

    443- Freight Transportation On The Great Lakes-St. Lawrence Seaway
      4432 Freight Transportation On The Great Lakes & St Lawrence Seaway

    444- Water Transportation Of Freight, Not Elsewhere Classified
      4449 Water Transportation Of Freight

    448- Water Transportation Of Passengers
      4481 Deep Sea Transportation Of Passengers Except Ferry
      4482 Ferries
      4489 Water Transportation Of Passengers

    449- Services Incidental To Water Transportation
      4491 Marine Cargo Handling
      4491a Marine Terminals
      4491d Moorages
      4492 Towing & Tugboat Services
      4493 Marinas
      4493h Marine Repairs
      4499 Water Transportation Services
      4499a Lighterage
      4499b Canal Operation
      4499d Ship Cleaning
      4499e Boat Launching Services
      4499f Boat Cleaning
      4499j Boat Transporting Services
      4499k Marine Salvage

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45-- Transportation By Air

    451- Air Transportation, Scheduled, And Air Courier Services
      4512 Air Transportation Scheduled
      4512a Airlines Certified
      4512b Airlines Non-Certified
      4512c Air Cargo & Express Package Services
      4513 Air Courier Services

    452- Air Transportation, Nonscheduled
      4522 Air Transportation Nonscheduled
      4522a Air Ambulance Services
      4522b Helicopter Charter & Rental Services

    458- Airports, Flying Fields, And Airport Terminal Services
      4581 Airports Flying Fields & Airport Terminal Services
      4581a Airports & Aircraft Maintenance
      4581b Airports With Terminals
      4581c Airports Without Terminals
      4581d Flying Fields
      4581e Military Fields
      4581f Aircraft Services & Maintenance
      4581g Airport Terminal Services
      4581j Aircraft Storage
      4581k Aircraft Upholsterers
      4581l Aircraft Ferrying & Transportation Services

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46-- Pipelines, Except Natural Gas

    461- Pipelines, Except Natural Gas
      4612 Crude Petroleum Pipelines
      4613 Refined Petroleum Pipelines
      4619 Pipelines

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47-- Transportation Services

    472- Arrangement Of Passenger Transportation
      4724 Travel Agencies
      4724a Transportation Arrangements
      4725 Tour Operators
      4725g Wholesale Tours
      4729 Arragement Of Passenger Transportation
      4729a Airline Ticket Offices
      4729b Steamship Ticket Offices
      4729c Passenger Transportation Services

    473- Arrangement Of Transportation Of Freight And Cargo
      4731 Arrangement Of Transportation Of Freight & Cargo
      4731a Freight Transportation Services
      4731b Freight Forwarders
      4731c Freight Consolidators
      4731e Transportation Brokerage
      4731f Customs & Custom House Brokers

    474- Rental Of Railroad Cars
      4741 Railroad Cars Rental
      4741a Railroad Car Rental With Services
      4741b Railroad Car Rental Without Services

    478- Miscellaneous Services Incidental To Transportation
      4783 Packing & Crating Services For Shipping
      4785 Fixed Facilities Inspection & Weighing Services For Motor Vehicles
      4785a Motor Vehicle Inspection & Weighing Services
      4785b Tunnels Toll Roads & Bridges
      4789 Transportation Services

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48-- Communications

    481- Telephone Communications
      4812 Radiotelephone Communications
      4812d Paging & Signaling Services
      4812e Mobile Telephone Services
      4813 Telephone Communication Except Radiotelephone
      4813a Long Distance Telephone Services

    482- Telegraph And Other Message Communications
      4822 Telegraph & Other Message Communications
      4822b Facsimile Transmission Service

    483- Radio And Television Broadcasting Stations
      4832 Radio Broadcasting Stations
      4833 Television Broadcasting Stations
      4833c Community Tv Services Antennas

    484- Cable And Other Pay Television Services
      4841 Cable & Other Pay Television Services
      4841a Cable Television Services

    489- Communications Services, Not Elsewhere Classified
      4899 Communication Services
      4899a Data Communications Services
      4899c Statellite Communication Services

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49-- Electric, Gas, And Sanitary Services

    491- Electric Services
      4911 Electric Services

    492- Gas Production And Distribution
      4922 Natural Gas Transmission
      4923 Natural Gas Transmission & Distribution
      4924 Natural Gas Distribution
      4925 Mixed Manufactured Or Lpg Production &/Or Distribution

    493- Combination Electric And Gas, And Other Utility Services
      4931 Electric And Other Services Combined
      4932 Gas And Other Services Combined
      4939 Combination Utilities

    494- Water Supply
      4941 Water Supply

    495- Sanitary Services
      4952 Sewerage Systems
      4953 Refuse Systems
      4959 Sanitary Services

    496- Steam And Air-Conditioning Supply
      4961 Steam And Air Conditioning Supply

    497- Irrigation Systems
      4971 Irrigation Systems