A variable valve timing control apparatus of an internal combustion engine has a drive rotary member, a driven rotary member, and an electric motor which rotates with the drive rotary member and changes a rotational phase of the driven rotary member relative to the drive rotary member through a current application to a coil. The apparatus further includes a grinding drum rotatably supported upon the frame. A first common linkage is coupled to the actuator and is operable to reciprocally move in a longitudinal direction relative to the actuator. The full-release scanner update is executed on the computers for security scanning. New polyuronic acid derivatives, as a dispersant, according to the present invention characterized in that polyuronic acids are attached by reductively amination, through reducing termini of the polyuronic acids, to glyceryl poly triamine. The edge ring RF voltage control arrangement is coupled to the edge ring to provide second RF power to the edge ring resulting in the edge ring having an edge ring potential.