7409190020 - Plates or sheets consisting of - a layer of a silicon nitride ceramic with a thickness of 0,32 mm (± 0,1 mm) or more but not more than 1,0 mm (± 0,1 mm) , - covered on both sides with a foil of refined copper with a thickness of 0,8 mm (± 0,1 mm) and - on one side partially covered with a coating of silver Harmonized System Codes, Taric Code, HS Code, HTS Code, Harmonized Commodity Description, Commodity Codes, Classification of goods, Tariff Nomenclature, Customs Tariff Number, Tariff Classification.