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| US4426235 | 26 Ene 1982 | 17 Ene 1984 | Kabushiki Kaisha Kobe Seiko Sho | Cold-rolled high strength steel plate with composite steel structure of high r-value and method for producing same |
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| US6315946 | 21 Oct 1999 | 13 Nov 2001 | The United States of America as represented by the Secretary of the Navy | Ultra low carbon bainitic weathering steel |
