与油管柱或工具装置的外表面相接合的工具通称，一般用于打捞目的。
A generic name given to tools that engage on the outer surface of a tubing string or tool assembly, generally for fishing purposes.
不过在一个世纪以前，一些神秘的机械碎片在希腊的海岸附近的船只遗骸上被打捞起来，这些装置上带有青铜齿轮和转盘。
But a century ago, pieces of a strange mechanism with bronze gears and dials were recovered from an ancient shipwreck off the coast of Greece.
装置具有结构简单，操作方便、速度快、打捞成功率高等特点。
The apparatus has characteristics of simple structure, convenient operation, fast speed and high salvaging success rate etc.
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