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Guarantee Electrical has been powering up St. Louis since it "guaranteed" to electrify the World's Fair in 1904. (It delivered on the guarantee). Now a major US electrical contractor, the company offers commercial, institutional, and industrial services including construction, design/build, communications/data, and maintenance. Guarantee Electrical operates throughout the country and has worked on such varied projects as the MGM Grand in Las Vegas and several post office and prison facilities. Its GECO Systems division installs and services intercom, closed-circuit television, and other audio-visual systems. The Oertli family owns and operates the firm.

Halcrow provides international management, planning, and design services for infrastructure development worldwide. It focuses on the transportation, water and power, maritime, and property sectors in more than 70 countries from its network of about 70 offices. One of Halcrow's most notable UK projects is the Channel Tunnel Rail Link, for which it helped provide design and project management. One of the UK's top engineering and consulting firms, Halcrow is also a leading international engineering and surveying firm. Originally founded in 1868 by Thomas Melk, the group was developed by notable engineer William Halcrow and became Sir William Halcrow & Partners in 1941. The name changed to Halcrow Group in 1998.

Halliburton Electrical keeps northwest England wired. The company -- no relation to engineering/construction giant Halliburton -- provides electrical services to commercial and industrial clients. The company's offerings include cabling systems, switchgear, fire alarm systems, heating, security lighting, and office refurbishment, among others. Halliburton Electrical serves clients mainly in the aerospace, food, manufacturing, hospital, and brewery industries, as well as local authorities and housing associations. Partner Brian Halliburton founded the company in 1963 and operates with his son and co-partner Stephen Halliburton.

Harley Ellis Devereaux offers architecture, engineering, interior, landscaping, planning, preservation, and other services from about a half-dozen offices in the Chicago, Detroit, Los Angeles, and San Diego metro areas. The company serves corporations, health care firms, universities, and government agencies; it has done work for such clients as Comerica, General Motors, Stanford University, and Chicago's Lincoln Park Zoo. Companies affiliated with Harley Ellis Devereaux offer such specialized services as crime lab design, environmentally sustainable design consulting, and real estate services.

Hazen and Sawyer's focus on water, wastewater and solid waste solutions. The environmental engineering firm specializes in planning, designing, and constructing clean drinking water systems for public and private clients around the world. Specific areas of expertise include architectural design, aquatic sciences, biosolids management, buried infrastructure, odor control, resource economics, risk management, utility management services, and wastewater and stormwater collection. The employee-owned firm operates from some 25 offices throughout the eastern US and two international branch offices in South America.

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