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==Patente==
 
==Patente==
*EP0249004 Process and apparatus for the production of a substrate having an energizing active charge
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*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
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