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ES91432A1924-11-121924-11-12Una traviesa de cemento armado para el asentado de las vías de ferrocarriles, tranvías y demás análogas.
ExpiredES91432A2
(es)
Un procedimiento para la fabricación de traviesas para ferrocarriles, tranvías y explotaciones análogas, columnas para redes aéreas, vigas, postes, tuberías y en general toda pieza y toda clase de obras de cemento u hormigón.