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direct off-state voltage epicycloidal wheel tooth frequency measurement by stroboscope heading change inertia Hgring-Hellebrand deviation Kharamodun M. L. A. nonpermeable pliability of wood ring-flux method robbe-grillet rod-drop method Sharm ash Shaykh stretch a point triangular cone pattern type grade ultrasonic thickness ga(u)ge unit fish effort water trough wilson