Shenzhen, the source of drilling hard Materials Co., Ltd. is a carbide-based products, high-tech enterprises.
深圳市钻源硬质材料有限公司是一家以硬质合金为主产品的高科技企业。
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The Changshan Salt Mine adopted tech nologies of free and inclined style windows opening for brine well repair. It is succeed to use side drilling with windows opening for brine well repair.