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

**Definition:** This place covers:

Auxiliary machines and methods specifically adapted for use in underground mines or in tunnels.

**Limiting references (this place does not cover):** - Breathing aids for curative purposes -> A61H31/00 - Respiratory apparatus -> A62B7/00 - Breathing apparatus for accidentally buried persons -> A62B33/00