MDU Resources builds and repairs the infrastructure our nation needs — the roads, the power lines, the electrical wiring and appliances, the building foundations. And MDU Resources supplies the energy and fuel our nation needs — building a strong America. In doing so, MDU Resources cannot overlook its responsibility to the environment, the communities we serve and our stakeholders. Through established operational practices and by leading or participating in a number of programs, MDU Resources helps ensure a viable environment. These practices include minimizing waste and maximizing resources, supporting environmental laws and regulations that are based on sound science and cost-effective technology and complying with or exceeding all applicable environmental laws, regulations and permit requirements.

Albany company's 1968 invention of the high-speed rolling door led Albany International to create the Albany Door Systems unit. Getting in and out quickly is key for Albany Door Systems. The division of Albany International, designs, manufactures and installs high-performance industrial doors. It also offers after-market replacement parts for its products. Albany Door Systems products include roll-up doors, folding doors, bifold doors, and overhead doors. Albany's interior and exterior doors are used at cold storage facilities, parking garages, auto dealerships, and manufacturing facilities. The division operates production plants and service centers in the US, Sweden, Germany, China, and Australia.

Ciments Francais is owned by Italian cement group Italcementi. Ciments Francais expects business to be rock solid, as it has since 1881. Ciments Francais is one of the largest cement producers in France, but it also has operations in about a dozen countries across Europe, Asia, and North America. Ciments Francais' annual production includes some 50 million tons of cement (its largest segment), in addition to aggregates and ready-mixed concrete. Ciments Francais operates more than 40 cement plants, some 90 aggregate quarries, and more than 350 ready-mixed concrete plants. It owns more than 50% of Egypt's Suez Cement.

The family-owned company was founded in 1946. Ernst Enterprises knows the value of a solid foundation. Operating as Ernst Concrete, Ernst Enterprises, Inc. makes and distributes ready-mix concrete and related products in Georgia, Indiana, Kentucky, and Ohio. Ernst Enterprises, Inc. also provides concrete pumping services for residential, industrial, commercial, and government clients. Ernst Enterprises makes standard concrete mixes as well as custom and specialty products at the approximately 30 plants it operates. Other products sold include trowels, marking implements, and other finishing tools; concrete nails, cures, and stains; and general construction supplies. The firm also sells used mixers to other concrete suppliers.

HeidelbergCement AG has operations in 40 countries in Africa, Asia, Australia, Europe, and North America. Subsidiary Hanson is a top building materials company in the UK. HeidelbergCement believes in concrete results. The company is one of the world's leading producers of cement and clinker (more than 100 million tons annually), and concrete; it is the largest cement producer in Germany. Cement, concrete, and aggregates together account for more than 90% of the company's sales. HeidelbergCement also has group services which manage fossil fuels and electricity for its operations and trade internationally in cement and clinker (an intermediate product used to make portland cement).

Lunda Construction Company,the heavy construction and industrial contractor builds highways, bridges, and dams across Wisconsin and surrounding Midwestern states. Its industrial division provides structural steel erection, marine construction, rigging, and other specialty services, including demolition, equipment rental, and construction management. Lunda's rail unit (operating under its heavy highway bridge division) performs both scheduled and emergency construction on railroads. Projects have included the I-94 bridge for the Wisconsin Department of Transportation. Founded in 1938, the company is still owned and operated by the Lunda family.

Marshfield just adores portals. Marshfield DoorSystems is a leading maker of commercial architectural wood doors in the US. The company sells its door and accessory products to the commercial construction industry nationwide. Marshfield DoorSystems offers customers more than 3 million possible made-to-order combinations of doors. The company's history dates back to Axel Hatteberg's establishment of Hatteberg Veneer Company in 1890. Before it was bought by Marshfield DoorSystems in 2000, the company was Weyerhaeuser's door division. Private equity firm Wind Point Partners and Marshfield DoorSystems' management own the manufacturer.

Niedermeyer Intertrade exports wood products from North America. The company specializes in power line construction materials such as pressure treated poles, crossarms and crossbraces, pole line hardware, and glulam (glue laminated) power poles. It also provides treated and untreated lumber, Eastern red cedar logs and veneer quality logs, and other building materials.

DORMA Americas is a leading global manufacturer of premium access solutions that enable better buildings. Our full range of products and services provides safety and security as well as convenience and comfort. DORMA features a design oriented portfolio of architectural door hardware, specialty hardware for glass door and wall applications, door automation systems including Crane Revolving Doors, and operable wall systems featuring Modernfold. DORMA Americas is part of DORMA Group Worldwide, a market leader of innovative and inspiring designs and technologies for access solutions.

Multi-trade subcontractor Ecker Enterprises specializes in drywall installation, painting, plastering, insulation and other specialty contracting services for commercial clients in Illinois and Florida and for residential customers in Illinois, California, and Nevada. Immigrant house painter Morris Ecker started the company that bears his name in 1923. Ecker Enterprises today is owned by employee shareholders.

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