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On the occasion of the arrival of the New Year in 1991, the editorial department of "Mechanical Workers" extended a festive congratulation to the vast number of readers, authors and correspondents to all the employees fighting on the mechanical industry front. "Mechanical Workers" has been invented since 1950 and has been through forty years. In the past 40 years, under the active support of the leaders of the National Federation of Trade Unions, the Ministry of Electrical and Mechanical Services and the National Association of Science and Technology, and with the enthusiastic help of the authors, readers, correspondents and reviewers, the "Mechanical Workers" has promoted the production technology of the machinery industry. Development, in order to improve the technical quality of mechanical workers, has done a lot of work and achieved great social and economic benefits.