• 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

• ERSystems

• Easy Heat Inc.

• Eclipse America

• EcoStar, Inc.

• Elbex Corporation

• Elk Corporation

• Elk Corporation

• Enduro Composites

• Envirospec, Inc.

• Envirospec, Inc.

• F. P. Smith Wire Cloth Co.

• Facilitec Corporation

• Fiore Skylights Inc.

• Firestone Metal Products

• GAF

• GS Metals Corp.

• Garlock Safety Systems