| http://www.w3.org/ns/prov#value | - A coil spring 15, the link 8 that is a vital component of the present invention, the elastic member 9 formed of a material such as polyurethane rubber, and a cushion receptacle 16 that holds the elastic member 9 are provided within the base member 3, and a collar 10a is provided straddling over the shaft portion 10 between the wall surfaces of the support plate 4.
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