| http://www.w3.org/ns/prov#value | - This stop ring 13, together with the lower guide ring 9, define the limits of the axial play of the felt ring 12, which in this manner, as is shown in particular in FIG. 3, encloses between it and the guide ring 9 a small annular chamber 14, in which a suitable supply of grease can accumulate for improving the lubrication of the lower guide ring 9.
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