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Laboratoires Francais de Chimiotherapie SA
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Laboratoires Francais de Chimiotherapie SA
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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
E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
E21B10/50—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of roller type
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FR1004158D1947-03-111947-03-11Produits intermédiaires pour la synthèse de substances oestrogènes, leur procédé de préparation et leurs applications
ExpiredFR1004158A
(fr)