A hybrid telephony system with packet switching as well as circuit switching optimizes utilization of transport networks, and is accessible from any conventional telephone set. The impeller is provided with a magnet ring which is energized with the stator coils of the base plate, so that the impeller is induced to rotate about the rotation shaft of the base plate. The carbide of the first carbide film and the carbide of the second carbide film differ from each other, and the hardness ratio of the first carbide film and the second carbide film is not more than 1. Embodiments can utilize ablation devices in conjunction with RF andor ultrasonic sources. The two sensors are fixed on the left side and the right side of the transparent back plate, respectively. The system includes a point-of-sale terminal system for processing a customer loyalty card and a central system for controlling point-of-sale terminal systems.