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Publication of BE681552ApublicationCriticalpatent/BE681552A/fr
E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
E21C35/18—Mining picks; Holders therefor
E21C35/183—Mining picks; Holders therefor with inserts or layers of wear-resisting material