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E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
E21B3/00—Rotary drilling
E21B3/02—Surface drives for rotary drilling
E21B3/025—Surface drives for rotary drilling with a to-and-fro rotation of the tool
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FR1200701D1954-01-201954-01-20Machine et appareillage pour l'enfoncement et l'arrachage de pieux, tubes et corps analogues dans un milieu résistant
ExpiredFR1200701A
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