A method including affixing an anterior mechanical supportive fastener to anterior portions of adjacent spinal structure by introducing the fastener from a posterior portion of a vertebra and passing the fastener through a curved portion to the anterior portions and fastening the fastener to the anterior portions. Then, address is determined based on an index signal as a standard of the time-divisional multiplexing, and the data are sequentially stored in a data memory. The heatsink has a main portion and an extension portion. Aperture portions for mounting rollers with adaptors are formed in an alternating pattern on the surfaces. The non-magnetic cap layer is completely covered with the non-magnetic insulating layer. Verification is accomplished by sending probe packets to select addresses on the subnet.