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Tunnelling on the Red Line subway has been halted twice this month, first when the drilling machine called ``Thelma'' hit water, and again when it encountered loose ground, a transit spokesman said Wednesday.
Scientists first convincingly demonstrated the electronic tunnelling phenomenon in semiconductors in the late 1950s, and since that time it has become the basis of several electronic components--among them tunnel diodes, which are good for some amplification and high-speed switching applications.
Each member company has participated in major tunnelling and construction projects throughout the world.