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| rathole (kleineren Durchmessers) | |||
| protection hole; advance borehole | |||
| pilot hole | |||
| breast bore (z. B. zum Erkunden von Standwasser); conductor shaft; fore borehole; pilot raise (in einem zu erweiternden Aufhauen); relief hole (zur Standwassererkundung); reliever; trial bore | |||
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