Calvin John

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

• Burglar Alarm Systems & Monitoring Services

North American Industry Classification System (NAICS) Categories:

• Electrical Apparatus And Equipment, Wiring Supplies, And Related Equipment Merchant Wholesalers > Alarms, Signaling & Security Equipment > Burglar Alarm Systems
• Security Systems Services (Except Locksmiths) > Anti-Theft Alarm Systems Services > Burglar Alarm Systems Monitoring Services

Standard Industry Classification (SIC) Categories:

• Electrical Apparatus & Equipment > Alarms, Signaling & Security Equipment > Burglar Alarm Systems
• Security Systems Services > Anti-Theft Alarm Systems Services > Burglar Alarm Systems Monitoring Services