Methods or devices for use in mines or tunnels, not covered elsewhere (mine lighting F21, H05B)

Child Classifications

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• E21F 17/02 Suspension devices for tubes or the like, e.g. for ventilating ducts (supporting pipes, cables or protective tubing in general F16L3/00 - F16L7/00)
• E21F 17/04 Distributing means for power supply in mines
• E21F 17/103 Dams, e.g. for ventilation
• E21F 17/16 Modification of mine passages or chambers for storage purposes, especially for liquids or gases (storing fluids in natural or artificial cavities or chambers in the earth B65G5/00)
• E21F 17/18 Special adaptations of signalling or alarm devices (for mine lifts B66B; gas-sensitive devices per se G01N)