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breaking-down effected by force or pressure applied to side of slit
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Industry
CPC
E21C27/14
This industry / category may be too specific. Please go to a parent level for more data
Parent Industries
E
FIXED CONSTRUCTIONS
E21
Mining
E21C
MINING OR QUARRYING
E21C27/00
Machines which completely free the mineral from the seam
Current Industry
E21C27/14
breaking-down effected by force or pressure applied to side of slit
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