lead-tong man 外钳工
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。
The utility model relates to a bi-directional gad tong with a trapezoid lead screw and pertains to a machining tool used for replacing an old gad tong (commonly known as a vise).
双向梯形丝杠平口钳为一种机械加工工具，用来代替老式平口钳（俗称虎钳）。
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