An overhead crane having an adjustable bearing assembly to adjust a wheel and axle of the crane in a horizontal direction in order to minimize skewing of the crane on a pair of parallel rails. A semiconductor substrate has an interlayer formed on an underlayer of a material containing silicon. In this manner, the material, generally a polymer, may be electromagnetically heated once the layer has been wrapped with a metallic reinforcing member. The critical delay paths are ranked based on the actual delay measurements, and the results are correlated to the predicted ranking of critical delay paths to produce a confidence measurement that measures the likelihood that the actual critical delay paths of the design have been tested for a given production batch of devices. A thin film having a particular color is attached to the side portion via the hot stamping system, which enables easy manufacture of the display apparatus having various colors of covers.