Hendrickson USA, L.L.C.

La Marche Manufacturing Company is a battery manufacturer and has been in business for more than 60 years. La Marche products include battery chargers, rectifiers, battery eliminators, power boards, power supplies, DC-DC converters, DC breaker panels, DC distribution panels, DC to AC inverters and DC system components and accessories, engine starting chargers, mining chargers, utility chargers, motive power chargers, marine chargers, aviation ground support chargers and railroad chargers. In addtion, all of its products are manufactured in the United States.

For more than 100 years, Chicago-based United States Gypsum Company has been a leader in producing products and systems to build the environments in which people live, work and play. As an inventor of wallboard and ceiling tile, USG was one of the companies to create the standards for North America's building materials industry. Its products are used in everything from major commercial developments and residential housing to simple home improvement projects. Its flagship brands include Sheetrock Brand gypsum panels and Durock Brand cement board, which are recognized throughout the world. USG is among the worlds leading producers of gypsum wallboard, joint compound and an array of related products for the construction and remodeling industries. It is also a worldwide leader in the manufacture of ceiling suspension systems and is recognized as a premier acoustical panel and specialty ceiling systems manufacturer. United States Gypsum Company has a location in Chicago.

Established in 1980, Guzzler Manufacturing is one of the leading companies that manufactures industrial vacuum loaders throughout the world. It is a group of industrial cleaning contractors that designs and builds a range of trucks. The company offers products for the cleaning of industrial waste and recycling raw materials. Guzzler Manufacturing serves various industries, including steel mills, railroads, oil refineries, and cement and chemical plants. The company is a member of the Association of Equipment Manufacturers and the Society for Protective Coatings. It has achieved ISO 9001:2000 certification from the International Organization for Standardization. Additionally, the company provides a variety of gauges, valves, blowers and gaskets. It operates a customer service center. Guzzler Manufacturing is a part of Federal Signal Corporation, which also operates Elgin Sweeper Company.