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The relevance of the research. One of the main technological parameters of the pellet impact drilling is the spacing between a drill bitand a holebottom. There are several methods and constructions of drill bits that allow keeping this distance with bit feet. https://www.roneverhart.com/Ryukyu-Kobujutsu-Buki-Jutsu-Vol-2-DVD-with-Kiyoshi-Yogi/
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