| http://www.w3.org/ns/prov#value | - Also when the inner tube 312 is pulled out to the maximum extent, as shown in FIG. 4, with respect to the inner tube 312, a stopper 313 formed at the distal end thereof (see FIG. 6) engages the inner wall of the unit connector 32 and a portion other than the vicinity of the distal end engaged will be exposed.
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