shaft borer

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• Shaft mining — Abandoned mine shafts in Marl, Germany. A …   Wikipedia

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• tunnels and underground excavations — ▪ engineering Introduction        Great tunnels of the world Great tunnels of the worldhorizontal underground passageway produced by excavation or occasionally by nature s action in dissolving a soluble rock, such as limestone. A vertical opening …   Universalium

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• Mining in the Upper Harz — The headframe of the Emperor William Shaft in Clausthal is one of the oldest surviving winding towers in Germany …   Wikipedia

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• Four-slide — A four slide machine The same four slide machine from another angle A fou …   Wikipedia

• Crusher — For other uses, see Crusher (disambiguation). A crusher is a machine designed to reduce large rocks into smaller rocks, gravel, or rock dust. Crushers may be used to reduce the size, or change the form, of waste materials so they can be more… …   Wikipedia