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Drill core holder and hollow core drilling method using a drill core holder
Drill core holder and hollow core drilling method using a drill core holder
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机译:钻芯支架和使用钻芯支架的空心钻方法
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摘要
The core holder (4) has a receiving sleeve (1) and a core supporting pin (2) which is provided with a threaded bolt portion for screwing into a core sample (5). The core supporting pin is provided with a nut (2a). The receiving sleeve is provided with a coolant passage for drill bit (3), and a pin receiving bore for securely holding the core supporting pin against slipping out towards the core sample. An independent claim is included for hollow core drilling method.
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