Twin City Signal

Twin City Signal is also listed under the following categories: Standard Yellow Pages Heading (SYPH) Categories:

• Control Systems & Regulators
• Railroad Contractors

North American Industry Classification System (NAICS) Categories:

• Industrial Building Construction > Railroad & Subway Construction > Railroad Contractors
• Electrical Apparatus And Equipment, Wiring Supplies, And Related Equipment Merchant Wholesalers > Electrical Control Systems & Materials > Control Systems & Regulators

Standard Industry Classification (SIC) Categories:

• Heavy Construction, Nec > Railroad & Subway Construction > Railroad Contractors
• Electrical Apparatus & Equipment > Electrical Control Systems & Materials > Control Systems & Regulators