| PATENT ASSIGNEE'S COUNTRY | Japan |
| UPDATE | 06.99 |
| PATENT ASSIGNEE | TDK |
| PATENT CLAIMS |
- Fe2O3 (15-30%) - CuO (6-12%) - NiO (58-79%) - PbO (1.5-4.5%) - Silica (1-3.7%) - CoO (0.7-1%) - ZnO (0.01-1%) |
| PATENT PHOTOCOPY | Available on request |
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