Distributing electric power; Cable networks; Conduits for cables (circuit arrangements for supplying or distributing electric power in general H02J)

Full Title

Methods or devices for use in mines or tunnels, not covered elsewhere (mine lighting F21, H05B) > Distributing means for power supply in mines > Distributing electric power; Cable networks; Conduits for cables (circuit arrangements for supplying or distributing electric power in general H02J)