About SAKUMA AKIMASA
About 日立金属 磁性材研
About TANIGAWA SHIGEHO
About 日立金属 磁性材研
About TOKUNAGA MASAAKI
About 日立金属 磁性材研
About TAKEDA SHIGERU
About 日立金属 磁性材研
About 日立金属技報
About permanent magnet
About Magnetic properties
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About 永久磁石
About 磁化反転
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