CPC Subgroup
E21F 17/103 Dams, e.g. for ventilation
Full Title
Methods or devices for use in mines or tunnels, not covered elsewhere (mine lighting F21, H05B) > Dams, e.g. for ventilation
2 direct subcodes
Child Classifications
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- E21F 17/107 inflatable
- E21F 17/12 Dam doors