CORPORACION NACIONAL DEL COBRE DE CHILE
Santiago, CL
CORPORACION NACIONAL DEL COBRE DE CHILE Patent applications | ||
Patent application number | Title | Published |
---|---|---|
20120181844 | CONTINUOUS MINING - A method useful in the continuous ore extraction in underground works intended for the permanent production of extraction from draw points or trenches, comprising the construction of reduced size drifts ( | 07-19-2012 |