E21F

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Description

SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINAGE IN OR OF MINES OR TUNNELS

Subclasses

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Subclass Title
1/00 Ventilation of mines or tunnels; Distribution of ventilating currents (ventilating rooms or spaces in general F24F)
1/02 Ventilation of mines or tunnels; Distribution of ventilating currents (ventilating rooms or spaces in general F24F) Test models (analogue computers therefor G06G 7/5)
1/04 Ventilation of mines or tunnels; Distribution of ventilating currents (ventilating rooms or spaces in general F24F) Air ducts (suspension devices E21F 17/02)
1/06 Ventilation of mines or tunnels; Distribution of ventilating currents (ventilating rooms or spaces in general F24F) Air ducts (suspension devices E21F 17/02) Duct connections (tube connections in general F16L)
1/08 Ventilation of mines or tunnels; Distribution of ventilating currents (ventilating rooms or spaces in general F24F) Ventilation arrangements in connection with air ducts, e.g. arrangements for mounting ventilators (ventilators per seF04D)

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