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| Winter Construction Co. Winter Group of Companies, which includes The Winter Construction Company, Winter Environmental Services, and Winter Properties, Inc.
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Mirra Company Underground utlility construction company located in Georgetown, Massachusetts, serving clients such as Bell Atlantic, RCN, Media One, and Lucent Technologies.
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Mivan Contracting company specializing in telecommunications network rollouts, interiors, theming, formwork and general contracting for the residential, commercial and industrial sectors.
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Austin Company, The Austin Company is an international organization of consultants, designers, engineers and constructors founded in Cleveland, Ohio.
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Bechtel Group Inc. Engineering, construction, management, development, and financing services worldwide.
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Telephone Company of Houston (TCH) Underground telecommunications contractor with the capabilities of overland, campus, and wide-area projects.
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Michels Brownville, Wisconsin company produces aggregates. Services in tunnel and underground utility construction.
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M.A. Mortenson Co. construction services include management, planning, development, consulting, preconstruction, design/build, engineer/procure/construct, maintenance & operations, and aviation.
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Holder Construction Co. Full-service provider of construction services. Headquartered in Atlanta, Georgia. Completed projects throughout the United States
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