An installation tool that is useful for the efficient and effective placement of an article, such as an artificial disc, between adjacent vertebral bodies is provided. These systems break down a sound field into sound events and non-sound events and separately localize the sound events and non-sound events. The first leg may mount through a first hole of the printed circuit board and include a compressible section to compress when inserted into the first hole and to expand after passing through the first hole. The grinding spindle head is fixed to a grinding spindle carriage so as to be pivotable around a vertical shaft, the grinding spindle carriage being movable in the direction of the x-axis via a displacement motor. A fourth data storing region of another one of the second storage volumes is allocated from the second pool by the second storage controller.