Mining or in situ disintegration of hard material
Cutter tooth or tooth head
Cleansing fluid passage
Inventor
active
Arrangement for supplying a pressurized liquid to a rotating mac
Cutting head for drift advancing machines
Cutting head for drift advancing machines and process for produc
Device for feeding fluid for the spraying of picks in a shearing
Device for intermittently subjecting axially shiftable bits of a
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