CPC Main Group
E21B 27/00 Containers for collecting or depositing substances in boreholes or wells, e.g. bailers, for collecting mud or sand; Drill bits with means for collecting substances, e.g. valve drill bits
3 direct subcodes
Child Classifications
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- E21B 27/02 Dump bailers, i.e. containers for depositing substances, e.g. cement or acids
- E21B 27/04 where the collecting or depositing means include helical conveying means