This is a reversal thinking operation concept against the pipe drilling method of casing pipe wall protection described in conventional books.
本方法与书本上所述的套管护壁跟管钻进方法有反向思维操作概念。
The utility model relates to an auxiliary accessory used for production of a ductile pipe casing enterprise, in particular to a novel supporting wheel for supporting a cast pipe to rotate.
本实用新型涉及球墨铸管企业生产用的辅助配件，特别指一种支承铸管转动的新型托轮。
The utility model relates to an auxiliary accessory used for production of a ductile pipe casing enterprise, in particular to a novel supporting wheel for supporting a cast pipe to rotate.
本实用新型涉及球墨铸管企业生产用的辅助配件，特别指一种支承铸管转动的新型托轮。
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