System 1

System 1 is also listed under the following categories: Standard Yellow Pages Heading (SYPH) Categories:

• Janitorial Services

North American Industry Classification System (NAICS) Categories:

• Janitorial Services
• Janitorial Services > Janitorial Services By Name

Standard Industry Classification (SIC) Categories:

• Building Cleaning & Maintenance Services, Nec > Janitorial Services