Instruments and Related Products Manufacturing for Measuring, Displaying, and Controlling Industrial, Power, Distribution, and Specialty Transformer Manufacturing, Relay and Industrial Control Manufacturing, Industrial Supplies Merchant Wholesalers

Electrical Contractors

All Other Specialty Trade Contractors

Industrial Building Construction, Commercial and Institutional Building Construction, Poured Concrete Foundation and Structure Contractors, Structural Steel and Precast Concrete Contractors, Framing Contractors

Coastal and Great Lakes Freight Transportation

Plumbing, Heating, and Air-Conditioning Contractors

Metal Service Centers and Other Metal Merchant Wholesalers

Site Preparation Contractors

Power and Communication Line and Related Structures Construction

Electrical Contractors

Machine Shops

Automobile and Other Motor Vehicle Merchant Wholesalers, Motor Vehicle Supplies and New Parts Merchant Wholesalers, Tire and Tube Merchant Wholesalers, New Car Dealers, Automotive Parts and Accessories Stores

Relay and Industrial Control Manufacturing

Janitorial Services

Electrical Contractors

New Single-Family Housing Construction (except Operative Builders), Residential Remodelers, Framing Contractors, Roofing Contractors, Siding Contractors

Plumbing, Heating, and Air-Conditioning Contractors

Highway, Street, and Bridge Construction

All Other Specialty Trade Contractors

Electrical and Electronic Appliance, Television, and Radio Set Merchant Wholesalers

Business Associations

Gasoline Stations with Convenience Stores

Lessors of Residential Buildings and Dwellings

Highway, Street, and Bridge Construction, Site Preparation Contractors, Sign Manufacturing, Other Miscellaneous Durable Goods Merchant Wholesalers

Commercial and Institutional Building Construction, Masonry Contractors, Roofing Contractors, Siding Contractors, Drywall and Insulation Contractors