Building, installation, repair and maintenance of cooling, ventilating, air-conditioning and heating systems for motor vehicles and for industrial purposes, and of parts for the aforesaid systems, in particular oil coolers, water coolers, air-to-heat exchangers, heat exchangers, including radiators, refrigerant evaporators and condensers, auxiliary PTC (positive temperature coefficient) heating apparatus and regulating apparatus, refrigerant expansion units, refrigerant pipes and collectors and dryers for refrigerants
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