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Located in Highland Park, Ill., Laurel Industries is a manufacturer of precision optics. Its products are used in alignment instruments, scientific instruments, microfilm readers, medical, food industry, refractometers, bar coders and many more. The company manufactures lenses, optical elements, prisms, wedges, crystal optics and black and white standards. Laurel Industries optical instruments include projection lenses, condenser lenses, aspheric lenses, lamp multi mirror lenses and many more. The lenses are also used in photoelectric controls, night vision systems, encoder discs and scales, weapon systems, laser alignment, scanning systems and telescopes.

Established in 1924, Plymouth Tube Company is a family-owned manufacturing business that provides a range of tubing products. It offers nickel, carbon and stainless steel alloys for mechanical, pressure, boiler and hydraulic applications. The company provides products under the brand names of HydraBrite, Sea-Cure and ProMoly. Plymouth Tube Company offers boiler and oil and gas carbon steel tubing solutions. It serves clients in the aerospace, nuclear, transportation, energy, industrial, pharmaceuticals markets. In addition, the company maintains more than 10 manufacturing plants in Wisconsin and Illinois. Plymouth Tube Company operates a subsidiary, Plymouth Engineered Shapes. Its Plymouth Tube Chicago Processing facility offers slitting and edging products.