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ES1654A1881-05-281881-05-28Un aparato consistente en rastros formados con cables erizados para remover el lecho de aguas con movimiento.
ExpiredES1654A1
(es)
Un aparato para evitar los choques de los trenes en las vías férreas por medio de señales seguras y perfectamente claras e inteligibles, el cual titula "Contra-choques" de trenes, o sea, Sistema de señales para indicar la marcha de los trenes en las vías