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Publication of FI36025ApublicationCriticalpatent/FI36025A/fi
E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
E21B7/00—Special methods or apparatus for drilling
E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
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FI36025D1957-10-181957-10-18Förfarande vid borrning av hål i ett under ett jordlager beläget berg samt för tillämpning av förfarandet avsedd anordning
FI36025A
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