Patent classifications
E
FIXED CONSTRUCTIONS
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E21
EARTH OR ROCK DRILLING; MINING
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E21B
EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
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27/00
Containers for collecting or depositing substances in boreholes or wells, e.g. bailers,; baskets or buckets; for collecting mud or sand; Drill bits with means for collecting substances, e.g. valve drill bits
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E21B27/02
Dump bailers, i.e. containers for depositing substances, e.g. cement or acids
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