| http://www.w3.org/ns/prov#value | - A clearance 218 is formed between the shoulder portion 212b and the recess 26 in such a manner as a communicate with the outside through an annular space 219 between the peripheral wall of the lower large-diameter portion 212c of the lower body 25 and the lower vent holes 220 formed at the bottom portion of the lower body 25.
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