E21F SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINAGE IN OR OF MINES OR TUNNELS
Introduced: September 1968
Last revised: July 1974
Classification Context
- Section:
- FIXED CONSTRUCTIONS
- Class:
- EARTH OR ROCK DRILLING; MINING
- Subclass:
- SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINAGE IN OR OF MINES OR TUNNELS
Description
E21F covers safety and operational infrastructure systems specific to underground mining and tunneling environments. This subclass encompasses devices and methods for worker protection, personnel rescue, material transport, mine ventilation systems, water drainage, and mine filling operations. The classification addresses the unique hazards of subsurface work, including gas accumulation, flooding, equipment movement, and emergency evacuation requirements. Adjacent classes E21C (drilling and boring) and E21D (mining) focus on extraction methods, whereas E21F emphasizes the support systems and safety infrastructure necessary for safe mining and tunnel operations.
Related Keywords
10 direct subcodes
Child Classifications
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- E21F 1/00 Ventilation of mines or tunnels; Distribution of ventilating currents
- E21F 11/00 Rescue devices or other safety devices, e.g. safety chambers or escape ways
- E21F 13/00 Transport specially adapted to underground conditions
- E21F 15/00 Methods or devices for placing filling-up materials in underground workings
- E21F 16/00 Drainage
- E21F 17/00 Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F 3/00 Cooling or drying of air
- E21F 5/00 Means or methods for preventing, binding, depositing or removing dust; Preventing explosions or fires
- E21F 7/00 Methods or devices for drawing-off gases with or without subsequent use of the gas for any purpose
- E21F 9/00 Devices preventing sparking of machines or apparatus