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1611-01 Paving Contractors
1611-02 Road Building Contractors
1611-03 Grading Contractors
1611-04 Parking Area Maintenance & Marking
1611-05 Asphalt Pavement Business
1611-06 Asphalt & Asphalt Products
1611-07 Pavement Marking
1611-08 Paving Materials
1611-09 Road Oiling
1611-11 Driveways Sealers
1611-12 Oils Asphalt & Road
1611-13 Oils Road
1622-01 Culverts
1622-02 Tunnelling Contractors
1622-03 Bridge Builders
1622-98 Bridge Tunnel & Elevated Highway
1623-01 Pipe Line Contractors
1623-02 Piping Contractors
1623-03 Gas Line Installation & Repair
1623-04 Water Main Contractors
1623-05 Pole Line Contractors
1623-06 Telephone & Television Cable Contractors
1623-07 Sewer Contractors
1623-08 Utility Contractors
1623-09 Fiber Optics
1623-10 Underground Wire & Cable Laying Contractors
1623-11 Conduit Contractors
1623-12 Telephone Wiring & Repair
1623-98 Water Sewer Pipeline & Comms/Power Line
1629-01 Pile Driving
1629-02 Docks (Builders)
1629-03 Marine Contractors
1629-04 Drainage Contractors
1629-05 Fill Contractors
1629-06 Drain Laying
1629-07 Tennis Court Construction
1629-08 Railroad Contractors
1629-09 Trenching
1629-10 Water Pollution Control
1629-11 Water Works Contractors
1629-12 Ditching Contractors
1629-13 Dockboards & Ramps
1629-14 Dredging
1629-15 Golf Course Construction
1629-16 Soil Solidification
1629-17 Sea Walls
1629-18 Fish Pools
1629-19 Caissons Structural
1629-20 Draglines
1629-21 Erosion Control
1629-77 Construction
1629-99 Heavy Construction Nec