| http://www.w3.org/ns/prov#value | - Referring to the attaching method, a stopper pin 52 the outer diameter of which for the portion other than the rear end portion is substantially equal with the inner diameter of the outer tube 2 and having a rear end portion with enlarged diameter is inserted to the rear end of the outer tube 2, the outer tube 2 is inserted from its tip into the outer tube hub 23 and then enforced till the rear en
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