Kazuhisa INABA has researched about intermetallic compounds between rare earth metals, between rare-earth metal and transition metal at graduate school of science. Further, he has researched about making phase diagram of Y-Ba-Cu-O series and Bi-Sr-Ca-Cu-O series known as high-temperature super-conducting materials at Institute Chemical Research, Kyoto University, when he was sent from Toda Kogyo Corporation to Institute Chemical Research, Kyoto University. He also has researched about magnetic iron oxide at Toda Kogyo Corporation.