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Shinji Ogino; Tatsuo Urushidani, and Hiroshi Kanemarii, all of Wah-Sang Wong, Montebello, and Wilharn D. Gray, Redondo Kanagawa, Japan assignors to Fuji Electric Co., Ltd., Japan This application Oct. 4, 1994, Ser. No. 317,983 U.S. Cl.