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dirt drill drilling engineer engineering excavation front geology grouting machine machinery metro mine mineral mining piperoof power securing site soil subway support supporting train tunnel tunneling underground worker workingTunnel Piperoof Grouting Editorial Photo
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Title
Tunnel piperoof grouting #79004069
Description
Geneva, Switzerland - May 22, 2014: Two workers preparing the machine for the construction of piperoof grouting for a tunnel
This image is editorial
