An electrically conductive ceramics comprises a compound containing at least one element belonging to the Group 3A of the periodic table and TiO.sub.2-x (0 Une céramique électriquement conductrice comporte un composé contenant au moins un élément appartenant au groupe 3A de la table et du TiO.sub.2-x périodiques (0
 
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< MAGNETIC FIELD MODULATION MAGNETIC HEAD, MAGNETO-OPTICAL ELEMENT, OPTICAL PICKUP DEVICE, AND OPTICAL DISK DRIVE, IN WHICH FIRST AND SECOND MAGNETIC CORES ARE PLACED ON OPPOSITE SIDES OF MAGNETIC FIELD GENERATION COIL TO ACHIEVE LOW POWER CONSUMPTION AND HIGH EFFICIENCY

> Rotational mask scanning exposure method and apparatus

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