| http://www.w3.org/ns/prov#value | - The crimping rings and tubes are then terminated on the enlargened side by a head portion having a spherical supporting surface such as illustrated in FIG. 6 engages the supporting surface provided at the outlet of the bores while being enabled by their supporting surface to be displaced according to a certain rotational angle within said bores 12, 13, 14, 15.
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