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1990年 4月 29日至 5月1日,杭州制氧机研究所隆重而欢快地进行了所庆三十周年活动,并圆满成功!
From April 29th to May 1st, 1990, the Hangzhou Oxygen Concentrator Institute held a grand and cheerful celebration of the thirtieth anniversary of the celebration. It was a complete success!