20 0 2年 1月 ,中国人民解放军第 35 31工厂(以下简称 35 31厂 )生产的给排水管道用橡胶密封圈被国家技术监督局推荐为连续合格产品 ,并在人民日报社《市场报》展示 ;同年 4月 ,35 31厂被河北省质量检验协会授予“产品质量信得过企业”称号 ;同年 6月 ,给排水管道用橡胶密封圈 In January 2002, the rubber sealing ring for water supply and sewerage pipes produced by 35 # 31 Factory of the People’s Liberation Army (hereinafter referred to as 3531 Factory) was recommended by the State Bureau of Technical Supervision as a continuous qualified product and published in People’s Daily, In April the same year, 35 31 factory was awarded the title of “Product Quality Trustworthy Enterprise” by Hebei Quality Inspection Association. In June of the same year, the rubber sealing ring for drainage pipe