Hans-Jörg Mertens

Eiffage Infra-Lärmschutz GmbH engages in the design and manufacture of noise protection devices on roads, railways, and private areas throughout Germany. It offers noise barriers made of wood, aluminum, reinforced concrete, glass, plastic, as well as masonry services. The company was founded in 1985 and is headquartered in Peine, Germany.

DTAD Deutscher Auftragsdienst AG specializes in the research and distribution of order information in the manufacturing, trade, marketing, information technology, and construction industries. It offers a database, which gives access to information on contracting entities and firms. This enables the detailed analysis and monitoring of competition and market. The company was founded in 2000 and is headquartered in Berlin, Germany.