Data burst communication techniques for mobile communication devices operating in packet data sessions are disclosed. The load platform has a frame with a base, a plurality of outriggers that extend therefrom, and a pair of rails that are aligned with the base. Each of the heat emitting sections has different radial widths, so that each of the heat emitting sections has radial cross-sectional areas different from each other, thereby capable of controlling a temperature distribution of each region of the electrical heating plate structure. This bearing unit can restrain disagreeable noises and vibration from being caused upon braking. A pulse width modulation circuit modulates a gate of the first transistor to maintain generator rectified voltage at a nominal level. The apparatus makes use of a device for contacting and positioning the products as they drop through a feed passage prior to encountering the cutting device so as to produce size-reduced products of more uniform size.