Shizuo Watanabe, Technical Supervisor, Bureau of Sewerage, Tokoy Metropolitan Government; Mr. Watanabe is the technical supervisor/deputy director at Bureau of Sewerage, Tokyo Metr...view moreShizuo Watanabe, Technical Supervisor, Bureau of Sewerage, Tokoy Metropolitan Government; Mr. Watanabe is the technical supervisor/deputy director at Bureau of Sewerage, Tokyo Metropolitan Government.view less