| http://www.w3.org/ns/prov#value | - A device associated with an ultrasonic system is used to rotate an image in an abdominal circumference about a Z-axis of a coordinate system in which an X-axis is a horizontal axis, a Y-axis is a vertical axis, and the Z-axis points in a perpendicular direction with respect to a plane defined by the X-axis and the Y-axis, so a spine of the fetus is in a substantially 6 o'clock direction, and a sto
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