本期介绍了几份国外专利文献,今长将陆续介绍这方面的资料。为了帮助續者查閲有关工具专业的专利文献,特此介绍一下苏联、美国、英国、西德、日本、民主德国、瑞士等国专利文献的查找方法。查得专利文献的途径很多,但最主要的还是根据 In this issue, we introduced several foreign patent documents. This year, we will continue to introduce information in this regard. In order to help the continuation person to review the patent documents related to professional tools, I hereby introduce the search methods for patent documents of the Soviet Union, the United States, the United Kingdom, West Germany, Japan, Democratic Germany, and Switzerland. There are many ways to find patent documents, but the most important one is based on