ES2437226A1
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Multi-lane wide gauge with four lanes (Machine-translation by Google Translate, not legally binding)
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ES2452479A2
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Mixed width crossboard with synthetic fasteners for rails
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PT103388A
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Three-carris preferred concrete track or mit bitola
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ES2257197A1
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IMPROVEMENTS INTRODUCED IN THE MANUFACTURE OF CONCRETE CROSSINGS FOR RAILWAY SYSTEMS.
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ES2255785A1
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IMPROVEMENTS INTRODUCED IN THE FIXING SYSTEMS TO THE THREE-RAIL RAILWAY CONCRETE CONCRETE TRAILERS OR MIXED WIDTH.
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ES271505A1
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Improvements in the construction of flexible travies of reinforced concrete for railway (Machine-translation by Google Translate, not legally binding)
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ES249708A1
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Improvements in the devices of extraction of liquids of acequias and similar (Machine-translation by Google Translate, not legally binding)
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