CPC Subgroup
E21C 41/16 Methods of underground mining (winning machines therefor E21C25/00 - E21C39/00); Layouts therefor
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
4 direct subcodes
Child Classifications
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- E21C 41/18 for brown or hard coal
- E21C 41/20 for rock salt or potash salt
- E21C 41/22 for ores, e.g. mining placers
- E21C 41/24 for oil-bearing deposits