首页>
外国专利>
basic structure of metal in reinforced concrete and prestressed to be prefabricated with vibrations and metal or concrete and metal fitted with elastic material and antivibrante and matterthe insulation opposite to stray currents for metropolitan tramway and railway track
basic structure of metal in reinforced concrete and prestressed to be prefabricated with vibrations and metal or concrete and metal fitted with elastic material and antivibrante and matterthe insulation opposite to stray currents for metropolitan tramway and railway track