CPC Subgroup
E21C 27/10 by both slitting and breaking-down
Full Title
Machines which completely free the mineral from the seam > by both slitting and breaking-down
2 direct subcodes
Child Classifications
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- E21C 27/12 breaking-down effected by acting on the vertical face of the mineral, e.g. by percussive tools
- E21C 27/14 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)