| http://www.w3.org/ns/prov#value | - As can be seen from comparison between, for example, FIGS. 16(a), 16(b) and 16(c) and FIGS. 19(a) and 19(b), while the plane light source unit produced in comparative example has a characteristic that light is emitted uniformly in all directions, the plane light source unit produced in accordance with the present invention has advantages that light is emitted in particular direction and that the m
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