Dango & Dienenthal Maschinenbau GmbH was founded as a non-ferrous metal foundry in 1865. Around the turn of the century (1901), the core business changed to special machine building. Equipment, such as taphole closing and opening devices (so called clay guns and taphole drills, manufactured for TMT - Tapping Measuring Technology, Siegen / Luxembourg) as well as mobile and railbound forging manipulators among other special handling machinery for metallurgical plants are being developed and manufactured today. Slag raking machines for steel plants and last but not least special filter technology for the purification of liquids in industrial plants round off the production program. DANGO & DIENENTHAL is located in SIEGEN (DDS), Germany . The company has got long-term experience as well as the highest market share among all of the suppliers in the above mentioned field. A specialized network of enterprises and subsidiaries abroad ( South Africa , North America, India and Japan ) covers all customer requirements. To expand the range of services the subsidiary DANGO & DIENENTHAL Hollerbach GmbH (DDH) was founded. Consequently engineering solutions for handling technology for heat treatment are available now.