National Data System

National Data System is also listed under the following categories: Standard Yellow Pages Heading (SYPH) Categories:

• Data Communications Equipment & Systems

North American Industry Classification System (NAICS) Categories:

• Computer And Computer Peripheral Equipment And Software Merchant Wholesalers > Data Communications Equipment & Supplies

Standard Industry Classification (SIC) Categories:

• Computers And Computer Peripherals Equipment And Software > Data Communications Equipment & Supplies