Prefabricated mine overcast arch and the like

Prefabricated support and covering structure, particularly...

Preload headboard for an elongate prop

Preparation of magnetic particles by reacting iron, cobalt,...

Preparation of magnetic particles by reacting iron, cobalt,...

Prestressed elastic arched mine roof support

Prestressing of mine props

Procede et appareillage de realisation du soutenement pour...

Process and apparatus for continuously lining a tunnel with...

Process and device for the exploitation of subterranean...

Process and device sealing barrier constructions in...

Process for communicating a water body with tunnels bored...

Process for consolidating and sealing coal and/or rock, soil...

Process for sinking of shafts

Process for the driving of a tunnel and tunnel borers therefore

Process for waterproofing surfaces

Process of grouting rockbolts in drill holes

Profile steel

Prop

Prop headboard