 ARC FABRICATORS, L.L.C. (South Dakota (US))
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details
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SWEETMAN CONST. CO. (South Dakota (US))
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details
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RAIL TO ROAD, INC. (South Dakota (US))
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details
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E & E R COMPANY (South Dakota (US))
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details
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ELLIS & EASTERN COMPANY (South Dakota (US))
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details
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BOMBARD MECHANICAL, LLC (Nevada (US))
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details
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ALASKA BASIC INDUSTRIES, INC. (Alaska (US))
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details
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WHC, LTD. (Hawaii (US))
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details
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FIDELITY OIL CO. (Delaware (US))
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details
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FIDELITY EXPLORATION & PRODUCTION COMPANY (Delaware (US))
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details
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LONE MOUNTAIN EXCAVATION & UTILITIES, LLC. (Nevada (US))
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KNIFE RIVER MARINE, INC. (Delaware (US))
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details
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MDU INDUSTRIAL SERVICES, INC. (Delaware (US))
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details
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CENTENNIAL ENERGY RESOURCES INTERNATIONAL, INC. (Delaware (US))
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CENTENNIAL HOLDINGS CAPITAL LLC (Delaware (US))
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details
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D S S COMPANY (California (US))
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JTL Group, Inc. (Montana corporation) (Montana (US))
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details
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JTL Group, Inc. (Wyoming corporation) (Wyoming (US))
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MDU CONSTRUCTION SERVICES GROUP, INC. (Delaware (US))
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 MDU Resources Luxembourg II LLC S.à.r.l. (Luxembourg)
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