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E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
E21B10/00—Drill bits
E21B10/36—Percussion drill bits
E21B10/38—Percussion drill bits characterised by conduits or nozzles for drilling fluids
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Drilling And Boring
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AT790363A1962-11-031963-10-02Verfahren zur Herstellung eines Hartmetallbohrers, insbesondere zum Bohren in hartem Material, wie Beton oder Stein
AT242579B
(de)
Verfahren zur Herstellung von Werkzeugen oder Werkstücken, insbesondere Maschinenmessern, und nach dem Verfahren hergestellte Werkzeuge oder Werkstücke, insbesondere Maschinenmesser