• Laminated Glass Corp.

• Laurence: C.R. Laurence Co.

• Legere Group, Ltd.

• LifeTime Aluminum Products

• Lincoln Windows

• M. G. M. Associates Inc.

• MW Manufacturers Inc.

• Madico

• Malta Wood Windows & Doors

• Marvin Windows and Doors

• Mason Electric Co., Inc.

• MasterCraft Cabinets, Inc.

• Maximum Security Products Co.

• Maxwell Alarm Screen Mfg.

• McKinney Drilling Company

• Megawood Industries

• Metalex Security Products

• Milgard Windows

• Milgo/Bufkin

• Modu-Line Windows

• Mon-Ray, Inc.

• Moss Supply Co.

• N. T. Jenkins Mfg. Co.

• National Bullet Proof, Inc.

• New Morning Windows

• Newco Structures, Inc.