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F500—1型石棉纤维分级筛和TQ—1A型比表面积测定仪部级技术鉴定会于1984年12月24～27日在成都召开。该两项课题由咸阳非金属矿研究所和航空工业部清江仪表厂
F500-1-type asbestos fiber grading sieve and TQ-1A-type surface area measuring instrument ministry-level technical appraisal meeting in December 1984 December 24 to 27 held in Chengdu. The two topics by the Xianyang Institute of Non-metallic Minerals and Aviation Industry Qingjiang Instrument Factory