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.

Rooftop Systems Inc. has grown to be the leading manufacturer of Commercial Air Conditioning Accessories in the industry. Established in 1983, RRS has grown from a 22,000 square foot shop to a 250,000 square foot automated production facility. We specialize in providing the highest quality products at a competitive price. We ship worldwide to a variety of customers that include Original Equipment Manufacturers (OEM), National Accounts, and Wholesale Distributors. Our ultimate customer is the installing contractor for the product, and we design every product with them in mind.

Dandi Systems makes prefabricated rigid-frame buildings and offers design services for customers, mainly within a 500-mile radius of its Kentucky headquarters. The company constructs its buildings from Southern yellow pine and clads them with steel sheet metal, which it rolls at its own facility. Dandi offers delivery or on-site assembly of its buildings, which are often used as barns, churches, garages, and small commercial businesses. Various additions such as windows, trim, and doors can be selected to customize each building. The company was founded in the early 1980s and is owned by company president Robert Cook.

The Brock Group of Companies when they need a handyman. Through a network of about 15 subsidiaries, The Brock Group acts as a specialty contractor to such companies as Chevron, CITGO, Exxon Mobil, Shell Oil, and Valero. It offers scaffolding and shoring, environmental remediation, asbestos and lead abatement, general labor and maintenance, disaster response, fireproofing, and insulation. The firm also offers offsite blast cleaning for machines that need to kept in tip-top shape. Besides oil refineries, The Brock Group serves chemical plants, energy plants, nuclear power plants, industrial manufacturers, pulp and paper mills, and offshore facilities.

Boral Limited has a big hand in building Australia. A leading producer of building and construction materials in Australia, Boral is also a top maker of roof tiles and bricks in the US (through Boral USA) and concrete in Indonesia. Through seven divisions the company produces concrete, cement, clay products, plasterboard, windows, roof tiles, timber, and other construction-related products. Boral Limited has more than 700 locations in the US, Asia, and Australia. Construction materials sold in Australia accounts for more than half of total sales.

Weaber manufactures rough and finished hardwood lumber, flooring, moulding, surfaced oak boards, and custom-cut wood products. Utilizing local species such as red oak, white oak, and poplar, the company also makes stair parts, logs, and secondary hardwood products such as wood chips, shredded bark mulch, dry planer shavings, and sawdust. Weaber processes some 50 million feet of hardwood logs annually. Walter H. Weaber established the plant in Pennsylvania's Appalachian forest in the 1950s. President and CEO Galen Weaber assumed ownership of the company in 1971 and has run it ever since.

Batson-Cook is well prepped in commercial construction. The firm offers general contracting, construction management, program management, and design/build services throughout the Southeastern US. It has worked on a wide variety of projects, including aerospace facilities, courtrooms, hospitals, hotels, industrial plants, offices, parking structures, places of worship, retail stores, and schools. Clients have included Lockheed Martin, Target, and the University of Tampa. Batson-Cook began in West Point, Georgia, in 1915. It operates from a handful of regional offices in Georgia and Florida. Construction and development firm Kajima U.S.A. acquired Batson-Cook in 2008.

Theodor Nagel deals in timber trading and operates sawmills. The company provides about 120 different kinds of timber, including five different species of ebony and 15 rosewood species, for manufacturing musical instruments such as pianos and stringed and percussion instruments, as well as for knife handles, ships decks, and crafts. The company, founded in Hamburg in 1837, is owned by the Krauth family, which has overseen operations for six generations.

Kathabar Dehumidification Systems engineers and manufactures liquid and dry desiccant systems for dehumidification and energy recovery applications. Any manufacturing or processing operation that is humidity-, temperature-, or microorganism-sensitive can be improved in reliability, economy, and efficiency with a Kathabar system.

Baldwin & Shell Construction's natural state is as a construction firm in The Natural State. Founded in 1946, Baldwin & Shell is a general contractor and commercial construction management company operating primarily in Arkansas. The company's services include general construction, project management, and renovation and remodeling, as well as assembly of prefabricated steel buildings. Its completed projects, many of which are located in Little Rock, include high schools, churches, industrial plants, office buildings, and hospitals.

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