• Chem Link, Inc.

• Circle Redmont, Inc.

• Classic Architectural Specialties

• Cleasby Manufacturing Inc.

• Closure Vent, Inc.

• Colony Custom Curbs

• Commodity Products Co., Inc.

• Conn-Fab Sales, Inc.

• CopperCraft

• Cor-A-Vent

• Cordeck

• Creative Building Supply & Sheet Metal Co. Inc.

• D+HE Mechatronic GmbH

• Dahlquist Clay Works

• Dawson Metal Company, Inc.

• Design Components, Inc.

• Dur-Red Products

• Duraflo

• ERSystems

• Easy Heat Inc.

• Eclipse America

• EcoStar, Inc.

• Elbex Corporation

• Elk Corporation

• Elk Corporation

• Enduro Composites