| 摘要 |
The present invention relates to a drill string for upward drilling and components therefor. The drill string comprises a shank adapter (11,14), a starter rod (25), an extension rod (26) and a drill bit (15). Said component s having means (13,22,14A,14B;17) for transferring impact waves and flushing medium. The shank adapter comprises a second shank adapter portion (14) releasably connected to a first shank adapter portion (11).
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