| http://www.w3.org/ns/prov#value | - The contact member may be provided by any one of various kinds of members other than the elastic retainer ring 206, or may be otherwise constructed to be provided in the lower end portion of the first axial portion 62.In this embodiment, as shown in FIG. 12, there is provided, in addition to the O ring 77 arranged to seal between the back pressure chamber 26 and the first axial portion 62, another
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