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

• Drilling & Boring Equipment & Supplies
• Utility Contractors

North American Industry Classification System (NAICS) Categories:

• Power And Communication Line And Related Structures Construction
• Industrial Machinery And Equipment Merchant Wholesalers > Drilling & Boring Equipment & Supplies

Standard Industry Classification (SIC) Categories:

• Constructing Water, Sewer, Power, & Communication Lines And Pipelines > Utility Contractors
• Industrial Machinery & Equipment > Chemical & Agricultural Industrial Equipment > Drilling & Boring Equipment & Supplies