The backup tong should be snubbed to the substructure or to an anchor post attached to the substructure.
内钳的钳尾绳应到底座或固定在底座上的钳尾桩上；
Lead and backup tong-men should not stand between the two pipe tongs while the driller is making up or breaking out pipe or collars.
当司钻正在上卸钻杆和钻铤时，内外钳工不要站在两个大钳之间。
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