WIPO世界知识产权组织：2025年国际专利分类指南报告（英文版）

Subgroup Title - The subgroup title precisely defnes a field of subject matter withine)the scope of its main group considered to be useful for search purposes. The title ispreceded by one or more dots indicating the hierarchical position of that subgroup, i.e.indicating that each subaroup forms a subdivision of the nearest group above it havingone dot less (see paragraphs 25 to 28, below). The subgroup title is often a completeexpression, in which case it begins with a capital letter. A subgr