Erich Weichselbaum

Bien-Zenker GmbH is a holding company, which develops and produces prefabricated houses. The firm specializes in the design, construction, and marketing of prefabricated houses of various sizes and architectural styles. Its product portfolio encompasses single-family and two-family dwellings, multi-family houses, bungalows, row houses, apartments, duplexes, maisonettes, and townhouses. It also provides construction design, home automation, and consulting services. The company was founded by Heinrich Bien in 1906 and is headquartered in Schluechtern, Germany.

ELK Fertighaus GmbH engages in the design, construction, and sale of pre-fabricated houses. Its products include semi-detached houses, bungalows, log cabins, duplexes, multi-family houses, and allotment houses. The company was founded by Johann Weichselbaum in 1959 and is headquartered in Schrems, Austria.