An electric discharge machining device includes a circular blade, a motor coupled to the circular blade for rotating the circular blade, and an electric discharge control system operatively coupled to the circular blade and a workpiece. The window assembly includes a frame having an inner metal edge and a window pane fixed to the frame. Embodiments of the present invention solve the problem of excessive size of a mobile terminal used for implementing transmitting diversity and receiving diversity, and also reduces bit error rate. The remote service provider maintains a website for authorized users to access the data. The machine is enabled to carry out transactions for multiple users simultaneously. The general coding equation for this method is such that: for an even integer n, it is represented by the conventional binary code of n2; for an odd integer n, it is represented by the conventional binary code of the one’s compliment of 2.