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Tunnel boring machine - Wikipedia

A tunnel boring machine ... Micro tunnel shield method is a digging technique used to construct small tunnels, ... Roadheader; Subterrene; Tunnel;

Herrenknecht - Official Site

Herrenknecht is the world market leader in mechanized tunnelling technology and offers high quality tunnel boring machines for every geology, additional equipment, and services.

Analysing International Tunnel Costs

Analysing International Tunnel Costs An Interactive Qualifying ... several cost factors on unit cost as well as the sensitivity in analysis with such a small dataset.