Discusses the of natural tourmaline material & technology used in air filtration field 讨论天然电气石负离子材料与技术在空气过滤领域的应用前景。
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Application in filtration field of welding smog or dust , mechanical process , pharmacy , cement industry and glutinous particles 适用于焊接烟尘,机械加工,制药,水泥工业及粘性介质的过滤