541330: Engineering Services (Primary)

541511: Custom Computer Programming Services

541512: Computer Integrated System Design

541513: Computer Facilities Management

541519: Other Computer Related Services

541611: Administrative Management and General Management Consulting Services

541618: Other Management Consulting Services

541690: Other Scientific and Technical Consulting Services

541715: Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)

541990: All Other Professional, Scientific, and Technical Services

517111:  Wired Telecommunications Carriers