Deutsche Bergwerks- und Hüttenbau GmbH (DBH, German for German Mine Construction) was a German company specializing in construction of mines and quarries. Established under the name of Preussische Bergwerks- und Hütten-AG in late 19th century, during World War II it ran one of the sub-camps of the Mauthausen-Gusen concentration camp complex.
References
Deutsche Bergwerks- und Hüttenbau Wikipedia(Text) CC BY-SA