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YOSHIMASA YAMAGUCH
Research Laboratory, Zenyaku Kogyo Co., Ltd., Ohizumimachi, Nerimaku, Tokyo 178, Japan
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MASAYA HIGASHI
Research Laboratory, Zenyaku Kogyo Co., Ltd., Ohizumimachi, Nerimaku, Tokyo 178, Japan
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HIDESHI KOBAYASHI
Research Laboratory, Zenyaku Kogyo Co., Ltd., Ohizumimachi, Nerimaku, Tokyo 178, Japan