Hötten Anlagenbau GmbH is a medium - sized engineering company located in the north of the Ruhr area and was founded in 1969 by the engineer Hermann Hötten . The Hötten team has been experie nced for up to more than 4 0 years now and has been a name for high technology products in the market . An essential component of Höttens extensive product range is machines and plants for the production of aerated concrete products. Hötten designs, supplies and erect production equipment and complete syste ms for the aerated concrete, dry mortar , lime grinding and other industrial plants .