Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
E21D17/00—Caps for supporting mine roofs
E21D17/02—Cantilever extension or similar protecting devices
E21D17/03—Brackets for roof-supporting bars
E—FIXED CONSTRUCTIONS
E21—EARTH OR ROCK DRILLING; MINING
E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
E21D11/14—Lining predominantly with metal
E21D11/28—Longitudinal struts, i.e. longitudinal connections between adjoining arches
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Engineering & Computer Science
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Mining & Mineral Resources
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Life Sciences & Earth Sciences
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General Life Sciences & Earth Sciences
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Geochemistry & Mineralogy
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Geology
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Architecture
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Civil Engineering
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Structural Engineering
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Processing Of Stones Or Stones Resemblance Materials
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