Material fracturing apparatus

Material gathering device for a mining machine

Material stripping apparatus

Means for removing the lining of a crucible furnace

Mechanically actuated impact mechanism

Mechanism for advancing continuous mining machine through mining

Mechanism for controlling the elevation of a coal planer

Mechanism for guiding a coal planer on the trough of a scraper c

Mechanisms for drawing a chain into or through a channel of a ch

Mechanized scaling bar

Method and apparatus for boring and shearing of rocks

Method and apparatus for breaking concrete or the like

Method and apparatus for drilling a tunnel

Method and apparatus for rubblizing and breaking concrete

Method and device for detaching or cutting out an embedded...

Method for boring and placing bolts for imbedding adhesively...

Method for replacing cutters of tunnel-excavating machine,...

Method of milling depressions and machine to perform same

Methods and apparatus for cutting circular slots in pavement ext

Methods and apparatus for removing moisture from air