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PCE
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Search for IPC and CPC classification codes or keywords
CPC Subgroup
E21C 41/18

for brown or hard coal

Full Title

Methods of underground or surface mining (E21C45/00 takes precedence); Layouts therefor (for peat E21C49/00) > Methods of underground mining (winning machines therefor E21C25/00 - E21C39/00); Layouts therefor > for brown or hard coal