breaking-down effected by force or pressure applied to side of slit, e.g. by wedges (breaking-down by means inserted in boreholes E21C37/00)

Full Title

Machines which completely free the mineral from the seam > by both slitting and breaking-down > breaking-down effected by force or pressure applied to side of slit, e.g. by wedges (breaking-down by means inserted in boreholes E21C37/00)

Child Classifications

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• E21C 27/16 with means for both slitting and breaking-down