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| Corporate Overview | | MDU Construction Services Group, Inc. | Bismarck, ND | 701-530-1000 |
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| Electric and natural gas transmission and distribution, excavation and communication, traffic and signalization | | Capital Electric Line Builders, Inc. | Kansas City, MO | 816-472-9500 | | Hamlin Electric Company | Ft. Morgan, CO | 970-867-8543 | | International Line Builders, Inc. | Tualatin, OR | 503-692-0193 | | Loy Clark Pipeline Co. | Tualatin, OR | 503-644-2137 | | Lone Mountain Excavating & Utilities | Las Vegas, NV | 702-474-4216 | | International Line Builders, Inc. | Riverside, CA | 951-682-2982 | | Rocky Mountain Contractors, Inc. | Helena, MT | 406-442-8761 | | Rocky Mountain Contractors, Inc. – Kalispell | Kalispell, MT | 406-752-4277 |
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| Commercial and industrial electrical, mechanical and fire suppression services | | Bell Electrical Contractors, Inc. | Maryland Heights, MO | 314-739-7744 | | Bombard Electric, LLC | Las Vegas, NV | 702-263-3570 | | Bombard Mechanical, LLC | Las Vegas, NV | 702-940-4822 | | Capital Electric Construction Company, Inc. | Kansas City, MO | 816-472-9500 | | Desert Fire Protection | Reno, NV | 775-329-1926 | | Desert Fire Protection | Las Vegas, NV | 702-388-1926 | | ESI, Inc. – Cincinnati | Cincinnati, OH | 513-454-3741 | | ESI, Inc. – Cleveland | Cleveland, OH | 440-349-2600 | | ESI, Inc. – Dayton | Dayton, OH | 937-293-6138 | | Oregon Electric Group | Portland, OR | 503-234-9900 |
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