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channel tunnel drilling machine - Cutting Head

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The Underground High Speed Transit System

The Rand Corporation: 1971 The Very High Speed Transit System. By: Robert M. Salter. Description of a very high speed transit (VHST) system operating in its own rarefied atmosphere in evacuated tubes in underground tunnels.

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Garrett Morgan - Inventor, Publisher - Biography

Learn more about Garrett Morgan's inventions, including a patented sewing machine, automated traffic light, hair straightener and respiratory hood, at Biography.com.

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tunnels and underground excavations | History, Methods, Uses

Tunnels and underground excavations: Tunnels and underground excavations, horizontal underground passageway produced by excavation or occasionally by nature’s action in dissolving a soluble rock.

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Underground excavations and structures - Britannica.com

Tunnels and underground excavations - Underground excavations and structures: While chambers in 1971 were being excavated in rock to fulfill a wide variety of functions, the main stimulus to their development had come …

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NIAGARA TUNNEL PROJECT - Niagara Falls

Alexander Herz Cogeis S.p.A. Tunnel Construction Director Tunnel Department Richard Everdell Project Director - Niagara Tunnel Project Ontario Power Generation

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