Apparatus and methods are effective in protecting the endplate of a vertebral body during use of a distraction tool. It utilizes a device for sampling a liquid present in the receptacle, enabling the method of placing said receptacle to be applied. If the LAN receiver receives an incoming call from a LAN and if the incoming call accompanies an IP address as a receiver address, the LAN receiver requests the LAN transmitter to make a call based on the incoming call, and the LAN transmitter requests the logger to log information about the call. The boost capacitor causes voltages the first and second sub-pixel regions to be at different voltages to increase the viewing angle of the display apparatus.