曲头钉：一种细金属钉；有时候一端是平头的。
不锈钢平口机又称端铣机、平头机。
Stainless steel mouth machine, also known as milling machines, flat head machine.
倒棱机是一种专用机床，主要用于对钢管端部进行平头及倒棱加工处理。
The Chamfering machine is a kind of special machine that mainly used to chamfer the end of pipe & tube.
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