File:The Soviet Union 1971 CPA 4050 stamp (Mechanical Engineering Plant (Increased Productivity)).jpg
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![File:The Soviet Union 1971 CPA 4050 stamp (Mechanical Engineering Plant (Increased Productivity)).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/1/11/The_Soviet_Union_1971_CPA_4050_stamp_%28Mechanical_Engineering_Plant_%28Increased_Productivity%29%29.jpg/800px-The_Soviet_Union_1971_CPA_4050_stamp_%28Mechanical_Engineering_Plant_%28Increased_Productivity%29%29.jpg?20150315092322)
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