| http://www.w3.org/ns/prov#value | - The principal group companies are Wolf Heiztechnik, Brink Climate Systems and Ned Air in the Climate Systems segment, which have specialised in heating, climate control and ventilation technology e.g. in the form of solar thermal systems, CHP units and residential ventilation systems with heat recovery, as well as Ubbink and Centrotherm, which have focused on gas flue systems and solar system comp
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