Industrial systems, installations and equipment and industrial products - Structuring principles and reference designations - Part 2: Classification of objects and codes for classes (IEC 81346-2:2019); German version EN IEC 81346-2:2019
工业系统、装置、设备和工业产品.结构原理和参考名称.第2部分:对象分类和分类代码(IEC 81346-2-2019);德文版EN IEC 81346-2:2019