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New patented system of lining for coal-mine and other types of tunnels, using concrete blocks shaped as truncated pyramids or as two truncated pyramids joined at their smaller bases.
New patented system of lining for coal-mine and other types of tunnels, using concrete blocks shaped as truncated pyramids or as two truncated pyramids joined at their smaller bases.
Neues Ausbauverfahren fuer Tunnel
Neues Ausbauverfahren fuer Tunnel
Bautechnik ; 12
1934
3 pages
Article (Journal)
German
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