A patient's body-supporting surface whose base part (17) can be pushed under the back and seat part (6,7), the height of the base part (17) being adjustable by means of a scissors-like arrangement and the lower ends of a pair of scissor-like legs (9) being hinged on longitudinal guides (13) which slide on guide elements (4) arranged on the undercarriage (1), whose height cannot be adjusted, of the patient's body-supporting surface.
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