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)
Introduced: September 1968
Title
Titles differ between systems:
IPC: breaking-down effected by force or pressure applied to side of slit, e.g. by wedges
CPC: 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
Full titles differ between systems:
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
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)
IPC and CPC are identically structured here. All 1 subcodes exist in both systems.
Child Classifications
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