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ES2066641A2
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MECHANIZED SYSTEM FOR THE IMPLEMENTATION OF LARGE SECTION TUNNELS IN LITTLE CONSISTENT LAND AND CORRESPONDING METHOD.
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ES2031765A6
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Hydraulic conveyor anchor mechanism - has anchor cylinder positioned parallel to conveyor
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ES2026789A6
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Brush-type protection system for removing carbon or another mineral, with non-guided free chains
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US4880109A
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Chain hauled conveyor belt
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DE2531832A1
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Large section tunnel drivage - has tunnel excavation face divided into centre and periphery parts worked independently
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ES432347A1
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Improvements in self-dischargeable hydraulic engineering machines. (Machine-translation by Google Translate, not legally binding)
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ES424721A1
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Continuous shoring machines for tunnel construction
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ES414134A1
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Tunneling methods and apparatus
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