| http://www.w3.org/ns/prov#value | - The columnar light-guiding unit 20 and the holders 21 are molded together by a transparent material such as polycarbonate, and are connected at only two points; namely, at the reflection face 13 on the emission face 12 of the taper rod 18A in the long direction of the base 5 and at the reflection face 15 on the emission face 12 side of the other taper rod 18B.
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