three-jaw independent chuck
... 三爪卡盘，三爪夹盘 jaw chuck 三爪分动卡盘 three jaw independent chuck 三爪自定心卡盘 centering chuck ...
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分动卡盘有四个爪，而万能卡盘只有三个。
The independent chuck has four jaws, while the universal chuck has only three.
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