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| US4017265 | 15 Feb 1972 | 12 Abr 1977 | | Ferromagnetic memory layer, methods of making and adhering it to substrates, magnetic tapes, and other products | | US5160600 | 5 Mar 1990 | 3 Nov 1992 | | Chromic acid free etching of polymers for electroless plating |
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