Review of gear effeciency equation and force treatment, Dr. Tsuneji YADA of YADA Engineering Consulting Office Sketch of Gear Expo '97 Ataka Eng.-Kenji Takakura Sketch of EMO Hannover '97 Ataka Eng.-Kenji Takakura Duplex Spread Blade Method for Cutting Hypoid Gears with Modified Tooth Surface by Niigata University Method for Inspection of Spiral Bevel Gears in Klingelnberg Cyclo-Palloid System by Niigata University Method for Cutting Straight Bevel Gears Using QUASI-COMPLEMENTARY Crown Gears by Niigata University