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E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
E21B4/00—Drives for drilling, used in the borehole
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AT197767D1957-03-231957-03-23Verfahren und Vorrichtung zur Herstellung von Bohrlöchern, vorzugsweise von Bohrschächten mit großem Durchmesser
AT197767B
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