CPC Main Group
E21F 15/00 Methods or devices for placing filling-up materials in underground workings (dams E21F17/103 )
4 direct subcodes
Child Classifications
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- E21F 15/02 Supporting means, e.g. shuttering, for filling-up materials
- E21F 15/06 Filling-up mechanically
- E21F 15/08 Filling-up hydraulically or pneumatically (hydraulic or pneumatic transport devices B65G; pipes, pipe couplings F16L)