一项填补国家空白的发明——慢回弹耳塞通过部级鉴定１９９８年２月１８日，由国家劳动部科技办主持的“新型（ＬＲ┐１）慢回弹耳塞”科研成果鉴定会在中国劳动科学研究院召开，与会专家一致同意该研究成果通过鉴定。这项科技成果是由中油气管道机械制造厂与劳动部劳动保... An invention to fill the gaps in the country - Slow resilience earplugs to pass ministry-level appraisal On February 18, 1998, a scientific appraisal of “new (LR┐1) slow rebound earplugs” hosted by the Ministry of Labor Science and Technology Office was held in China Labor Science Research Institute was held, the participating experts unanimously agreed that the research results through the identification. This scientific and technological achievements by the China Petroleum Pipeline Machinery Factory and Labor Department Labor Insurance ...