二、分类法 在采用分类法的国外科技文献检索工具书中,收录最全,最有实用价值,而又最容易学会的是英国的《世界专利目录周报》(World Patents Index Gazette).现在我们就以此目录周报为例,介绍一下采用分类法的检索工具书的使用方法。 《世界专利目录周报》(以下简称目录周报)是由英国德温特公司出版的,创刊于1974年,收录25个国家的专利说明书目录。从1979年起,增加报 Second, the taxonomy In the use of taxonomies of foreign science and technology literature search tool, contains the most complete, most practical value, but the most easy to learn is the British “World Patents Index Gazette.” Now we Take this weekly catalog as an example to introduce how to use the taxonomy search tool. “World Patent Directory Weekly” (hereinafter referred to as the weekly catalog) is published by the United Kingdom Derwent company, founded in 1974, contains the list of patent specifications in 25 countries. Since 1979, increase newspaper