After forming a primary powder bed at a toothed portion of an article, such as a gear or a spline shaft, by electrostatic powder coating process, the powder bedlayer is removed from crests of teeth in the toothed portion by a specified thickness by scraping it off while sucking up the scraped powder. The method uses operative sensors such as friction sensors for detecting and improving control during finishing. Thus, a deterioration of the speech quality due to performing unnecessary audio data encodingdecoding is avoided and the bandwidth in the PLMNdata network can be utilized more efficiently. The ultrasound tip possesses at least one radial surface, a cavity, or some other form of a hollowed out area, within at least one of the radial surfaces, and a cutting member at the opening of the cavity. The emulsifiers that exhibit the shoulder exhibit good stability without causing formation damage.