| http://www.w3.org/ns/prov#value | - It should be understood that, when both of the shutter leaves 153A and 153B are in their light interception positions, since the connector hole 104 a is closed up over almost its entire cross sectional extent by the edge portions 153 a of these shutter leaves 153A and 153B mutually overlapping one another, in this state, as for example shown in FIG. 40, the light which is emitted from the optical
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