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Publication of FR1052878ApublicationCriticalpatent/FR1052878A/fr
E21C27/00—Machines which completely free the mineral from the seam
E21C27/10—Machines which completely free the mineral from the seam by both slitting and breaking-down
E21C27/12—Machines which completely free the mineral from the seam by both slitting and breaking-down breaking-down effected by acting on the vertical face of the mineral, e.g. by percussive tools
E21C27/128—Machines which completely free the mineral from the seam by both slitting and breaking-down breaking-down effected by acting on the vertical face of the mineral, e.g. by percussive tools with breaking-down members functioning on the slitting level
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Life Sciences & Earth Sciences
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Geochemistry & Mineralogy
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FR1052878D1951-02-031952-02-02Installation pour l'abatage du charbon et autres minéraux
ExpiredFR1052878A
(fr)