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This page displays all 「FI」 in main group E21B27/00. |
HB:Handbook | ||||
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CC:Concordance | |||||
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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 [6,8] | HB | CC | 2D129 | |
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.Dump bailers, i.e. containers for depositing substances, e.g. cement or acids [6,8] | HB | CC | 2D129 | |
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.where the collecting or depositing means include helical conveying means [8] | HB | CC | 2D129 | |