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Oka Kai was a club that, according to a letter in the file, had about fifty members. People associated with this organization include Toshio Nakano (president), Hisakichi Tanaka (treasurer), and Yoshikazu Oura.
Oka Kai was a club that, according to a letter in the file, had about fifty members. People associated with this organization include Toshio Nakano (president), Hisakichi Tanaka (treasurer), and Yoshikazu Oura.