CPC Main Group
E21C 41/00 Methods of underground or surface mining (E21C45/00 takes precedence); Layouts therefor (for peat E21C49/00)
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- E21C 41/16 Methods of underground mining (winning machines therefor E21C25/00 - E21C39/00); Layouts therefor
- E21C 41/26 Methods of surface mining (machines for obtaining, or the removal of, materials in open-pit mines E21C47/00); Layouts therefor
- E21C 41/32 Reclamation of surface-mined areas (machines or methods for treating or working soil for agricultural purposes A01B77/00, A01B79/00; machines for back-filling E02F5/22)