At&T

At&T is also listed under the following categories: Standard Yellow Pages Heading (SYPH) Categories:

• Telephones Communications Services
• Utility Location Services

North American Industry Classification System (NAICS) Categories:

• Electric Power Distribution > Energy Services > Utility Location Services
• Wired Telecommunications Carriers > Local & Long Distance Telephone Service

Standard Industry Classification (SIC) Categories:

• Telephone Communications, Except Radio > Local & Long Distance Telephone Service
• Combination Utilities, Nec > Utility Locating Services