National

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

• Building Materials & Supplies
• Electric Equipment & Systems
• Security Service & Systems

North American Industry Classification System (NAICS) Categories:

• Electrical Apparatus And Equipment, Wiring Supplies, And Related Equipment Merchant Wholesalers > Alarms, Signaling & Security Equipment
• Other Building Material Dealers
• Security Systems Services (Except Locksmiths)

Standard Industry Classification (SIC) Categories:

• Electrical Apparatus & Equipment > Alarms, Signaling & Security Equipment
• Lumber & Other Building Materials
• Security Systems Services