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      A tunnel boring machine (TBM), also known as a "mole", is a machine used to excavate tunnels with a circular cross section through a variety of soil and rock strata.

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    • Screw Wikipedia

      A screw is a type of fastener, sometimes similar to a bolt (see Differentiation between bolt and screw below), typically made of metal, and characterized by a helical ...

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      The World Mining Equipment directory lists companies that provide equipment and services to mines and mills on a worldwide basis.