1. Method and machine for excavating drifts, tunnels, stopes, caverns or the like

Procede et machine d'excavation de galeries, de tunnels, de gradins, de cavernes ou analogue

2. Automatic control of a machine used for excavating drifts, tunnels, stopes, caverns or the like

Commande automatique de machine servant a excaver galeries, tunnels, chambres, cavernes ou analogues