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old tunneling machine for opal mining

Known as the New Austrian Tunnel Method or the sequential excavation method is a form of tunneling that was first recognised in the 1960s The NATM is different from the old Austrian Tunnel Method because it relies on an understanding of the geological properties of the surface being tunneled in to

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    Known as the New Austrian Tunnel Method or the sequential excavation method is a form of tunneling that was first recognised in the 1960s The NATM is different from the old Austrian Tunnel Method because it relies on an understanding of the geological properties of the surface being tunneled in to

    Read More
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