Cornerstone Telephone

Cornerstone Telephone is also listed under the following categories: Standard Yellow Pages Heading (SYPH) Categories:

• Electric Contractors
• Telephones Communications Services

North American Industry Classification System (NAICS) Categories:

• Electrical Contractors
• Wired Telecommunications Carriers > Local & Long Distance Telephone Service

Standard Industry Classification (SIC) Categories:

• Electrical Work
• Telephone Communications, Except Radio > Local & Long Distance Telephone Service