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Comments on comment by Lutz Genscher
Lutz Genscher on Untitled (): I don't think Glasgow metro is going to enlarge its tunnels but since it...
cover tunnel photo by: Matt Brown from London, England / CC BY
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GTA - Tunnel Enlargement Gantry 8400A (drill & blast)
GTA - Tunnel Enlargement Gantry 8400A (drill & blast)
www.youtube.comDrill and blast technique with a Tunnel Enlargement Gantry from GTA