| http://www.w3.org/ns/prov#value | - FIG. 5 shows the back surface of the cover panel 150 in a state where the cap 170 is installed in the panel body 160. [0070] As shown in FIG. 5, the cover panel 150 is a plate-shaped panel in a rectangular form having approximately the same thickness throughout the entire section thereof, in the state where the cap 170 is installed in the panel body 160. [0071] The cover panel 150, whose back surf
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