Modular system for the laying of underground and railroad and tram lines
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System for building a railway of the type without ballast
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A reinforced conventional concrete pipe having an evenly distributed sted wire reinforcement and method for its manufacture
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Process and apparatus for manufacturing single piece railroad ties of prestressed concrete
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Railway sleeper reinforcing rod mfr. - has cutting, threading and bending operations performed automatically under computer control
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Process and apparatus for manufacturing single piece railroad ties of prestressed concrete
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Process and apparatus for the manufacturing of tubular members made of projected concrete with an evenly distributed reinforcement and products thus obtained
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Elastic gasket for conduction tubes and device for assembly of the joint (Machine-translation by Google Translate, not legally binding)
