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Drill system extension for drilling longer length holes comprises drills with internal and external threads and extension elements
Drill system extension for drilling longer length holes comprises drills with internal and external threads and extension elements
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机译:用于钻较长长度孔的钻探系统扩展包括带内外螺纹的钻头以及扩展元件
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摘要
The drill system is designed in several parts to drill deep holes (more than 500 metres). The drill system comprises drills (4) and extension elements (3) and is made of steel. The extension elements have external (1) and internal (2) threads.
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