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Variable Multi-contact Circumferential Cuff Skeleton Markings; (a) Posterior markings (1–6) (0.5 mm apart) (b) Frontal 0° line (red) across the 6 mm polyurethane tube. (c) Frontal view of the 6 mm polyurethane tube with the 5.5 mm mark (top) and the 2.5 mm mark (bottom). (d) Marking of two points 0.46 mm to the right and left of the upper and lower 270° lead marks using the space between two-millimeter marks and a centimeter mark of a ruler.
