• Raydot

• Rebecca Schunck Wallpaper Installation and Removal

• Roberts-Gordon

• Robertson Mfg. & Engrg Int'L

• Rupp Industries Inc.

• SMRT, Inc.

• Schroeder Murchie Laya Associates, Ltd.

• Security Steelcraft Corp.

• Seneca Environmental Products

• Shandon Lipshaw

• Spencer Turbine Co.

• Staclean Diffuser Company

• Stansteel and Hotmix Parts and Service

• Steelcraft Corp.

• Steril-Aire

• Sullivan-Palatek

• Super Vacuum Mfg. Co.

• TSI

• Techmaster Inc.

• Telaire Systems

• Tempest Controlled Airstream

• The Howden Fan Company

• Tjernlund Products, Inc.

• Trent Technologies

• Trevor-Martin Corp

• Tri Dim Filter Corp.