| http://www.w3.org/ns/prov#value | - The elongated channel 116 is formed of a flexible synthetic resin having titanium dioxide and a pigment such as white lead blended therewith, the fluorescent material strip 117 is formed of a transparent synthetic resin sheet having a fluorescent pigment blended therewith and the transparent covering strip 118 is formed of a transparent synthetic resin having a ultraviolet ray absorption agent ble
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