shannxi hainaisen petroleum technology Co.Ltd

Date: 22nd April 2016
Diamond Core borr
V?r PDC petroleum borrning bit / olja & gas borra lite, vilka alla anv?nds f?r borrning oljef?lt. J?mf?rt med st?l bitar, ?r matrix kroppen mer l?mplig f?r h?rdrock. Bits livstid ?r tv? g?nger ?n st?l kroppen.
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