A non-linear technique for diagnosing spur gear tooth fatigue cracks: volterra, kernel approach; An Incremental Capacitive Sensor for Harsh Environment; Bending Load Capacity Enhancement Using an Asymmetric Tooth Profile (1st Report, Influences of Pressure Angle on Tooth Root Stress and Bending Stiffness);Capacitive sensor for incremental angular measurement;Defining the residual stresses on the gear tooth……