| 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, heat pumps, CHP units, biogas treatment plants, and climate control and ventilation systems with heat recovery for residential and commercial buildings; Ubbink a
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