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| US5135724 | 10 Abr 1991 | 4 Ago 1992 | Hoechst Aktiengesellschaft | Process and apparatus for the surface treatment of sheet-like structures by electric corona discharge |
| USRE30555 | 8 Nov 1979 | 24 Mar 1981 | | Method of producing string of polyamide and stringed rackets with such string |
