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A FORM FOR PRODUCING A CONCRETE LINING OF MINE GALLERIES, TUNNELS, SHAFTS OR THE LIKE
A FORM FOR PRODUCING A CONCRETE LINING OF MINE GALLERIES, TUNNELS, SHAFTS OR THE LIKE
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机译:用于生产矿井,隧道,竖井或类似物的混凝土衬里的表格
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摘要
A shuttering or form for producing a concrete lining in galleries, tunnels, shafts or the like, in which the concrete is introduced between an inner shuttering and the natural soil, the concrete lining being supported by the form until the concrete has reached its desired strength.
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