• Cardkey Security Systems

• Casi-Rusco

• Catamount Corporation

• Cease Fire by Dis-Cover

• Checkpoint Systems, Inc.

• Chubb Security Systems

• Clean Team Company

• Cohu

• Compu-Gard

• Compuquest, Inc.

• Concrete Products Co. of Sioux City, Inc.

• Conestoga Log Cabins

• Control Module

• Control Products

• Control Systems International, Inc.

• Controlled Access, Inc.

• Corr: Thomas Corr Associates

• Cotag International

• Crescent Electric Supply Co.

• D/B Cameras-Micro Check

• DADCO Corporation

• DCX Systems

• DSX Access Systems

• Dactek International

• David W Kimble and Associates

• Designed Security, Inc.