236115 - New Single-Family Housing Construction (except Operative Builders)
236116 - New Multifamily Housing Construction (except Operative Builders)
236117 - New Housing Operative Builders
236118 - Residential Remodelers
236210 - Industrial Building Construction
236220 - Commercial and Institutional Building Construction
237130 - Power and Communication Line and Related Structures Construction
237990 - Other Heavy and Civil Engineering Construction
238210 - Electrical Contractors and Other Wiring Installation Contractors
334113 - Computer Terminal Manufacturing

517110 - Wired Telecommunications Carriers
517919 - All Other Telecommunications

541310 - Architectural Services
541320 - Landscape Architectural Services
541330 - Engineering Services
541350 - Building Inspection Services
541370 - Surveying and Mapping (except Geophysical) Services
541410 - Interior Design Services
541420 - Industrial Design Services
541430 - Graphic Design Services
541511 - Custom Computer Programming Services

541513 - Computer Facilities Management Services
541519 - Other Computer Related Services
541611 - Administrative Management and General Management Consulting Services
541612 - Human Resources Consulting Services
541690 - Other Scientific and Technical Consulting Services
541990 - All Other Professional, Scientific, and Technical Services
561110 - Office Administrative Services
561210 - Facilities Support Services
561320 - Temporary Help Services
561499 - All Other Business Support Services
561611 - Investigation Services
561612 - Security Guards and Patrol Services
561613 - Armored Car Services
611430 - Professional and Management Development Training
811213 - Communication Equipment Repair and Maintenance
922190 - Other Justice, Public Order, and Safety Activities
923130 - Administration of Human Resource Programs (except Education, Public Health, and Veterans' Affairs Programs)

Standard Industrial Classification (SIC)
4813 - TELEPHONE COMMUNICATIONS, EXC.RADIO
7381 - DETECTIVE & ARMORED CAR SERVICES
7382 - SECURITY SYSTEMS SERVICES

Product Service Codes (PSC)
6350 - MISCELLANEOUS ALARM, SIGNAL, SEC SYSTEMS
R423 - PROF SVCS/INTELLIGENCE SERVICE
R424 - PROF SVCS/EXPERT WITNESSES
R497 - PERSONAL SERVICES CONTRACTS
R499 - OTHR PROFESSIONAL SVCS
R612 - INFORMATION RETRIEVAL