"1952" . "Toshiaki" . "堅田利明" . "堅田利明" . "Katada" . "Toshiaki Katada" . "堅田" . "トシアキ" . "利明" . "カタダ" . "toshiaki Katada" . "トシアキ カタダ" . . "利明 堅田"@ja-JP . . "Toshiaki Katada" . "toshiaki" . . . .