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→Patente
==Patente==
==Patente==
*EP0249004 Process and apparatus for the production of a substrate having an energizing active charge
*EP0249004 Process and apparatus for the production of a substrate having an energizing active charge [http://www.freepatentsonline.com/EP0249004.html]
*US Patent 5138172
*US Patent 5138172
*US Patent 5012110
*US Patent 5012110