🌐EnglishEnglishDeutschEspañolNederlandsPortuguêsTiếng ViệtРусскийفارسی한국어中文日本語EntityQ2016868· pop 14· linked from 117 articlestunnelling shieldprotective structure used during the excavation of tunnelsAvailable in 14 languagesEspañolDeutsch中文日本語РусскийPortuguêsBanglaCatalanNederlandsTiếng ViệtConnectionsLondonCityTaiwanCountryCategoriesTunnel boring machines