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PCE
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DIFF Subgroup
E21C 41/20

for rock salt or potash salt

Introduced: January 1990

Full Title

Full titles differ between systems:

IPC:

Methods of underground or surface mining; Layouts therefor > Methods of underground mining; Layouts therefor > for rock salt or potash salt

CPC:

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 rock salt or potash salt

No child classifications to compare. This is a leaf node in both IPC and CPC.