Tunnel Piperoof Grouting. Geneva, Switzerland - May 22, 2014: Construction Of Piperoof Grouting For Tunnel Construction
ID 864907130815 © oliverfoerstner | Megapixl.com
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boring building chamber concrete constructing construction digging 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 working
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