A medical robotic system comprises a drive track unit being operable for moving the medical robotic system along a floor. The graphite soundboard provides the acoustic guitar with a unique appearance and enhances durability without adversely affecting the tonal qualities of the guitar. The tilting flap covers one of the two portions of the panel surface in the pixel zone when the flap lies in each of its two stable positions. In another embodiment, the tooth surface is selectively stained to reveal the presence and location of the composite filling. Thus, a manufacturing method that makes it possible to manufacture a semiconductor device achieving outstanding data retention characteristics and capable of sustaining a specific threshold voltage level while minimizing the increase in the production costs is provided.