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Multi-purpose drill bit has depth-limiting surrounding disc fitted at shank mid-point
Multi-purpose drill bit has depth-limiting surrounding disc fitted at shank mid-point
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机译:多功能钻头的柄中点处装有限深的环绕盘
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摘要
A multifunctional drill bit has a shank with a fixed surrounding disc fitted at approx. the mid-point. The disc has two holes which receive the ends of two concentric springs which surround the bit. The springs support a brush or a surrounding plate.
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