| http://www.w3.org/ns/prov#value | - When the user rotates the display body 21 to the clock-wise direction behind the main body 11 in order to control the tilt angle of the display panel 23, for example to yield an obtuse angle as shown in FIG. 6, the supporting plate 53 moves to the counter clock-wise direction centered on the rotation shaft 51 relative to the angle or amount of movement of the display body 21, which is centered on
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