In a right or nearly right angle to the Fläche3 and within the range of the cross leg angeord net the further firm supporting surface 4 is intended. This supporting surface is somewhat smaller held than the supporting surface 3 and the cross leg in the form on fit. At the upper end of the supporting surface 4 the managing Wulst5 begins,
that the S-shaped Krüm mung the spinal column is adapted
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