A front structure of a vehicle body having a pair of right and left front frames. Sense amplifiers are positioned between adjacent rows in the individual arrays while row decoders are positioned between adjacent columns in the individual arrays. Core sheets each include preformed radial accommodating slots the number of which is expressed by P2. The control may apply an edge detection algorithm to a reduced image data set of the image data set. Moreover the upper tool table for the first time includes associated second drive means for driving the pre-stretch means movably mounted in the upper tool.