| http://www.w3.org/ns/prov#value | - Because of the existence of jar 19, it is known that when a certain force has been exerted, sufficient for ensuring correct fixing of the casing on the connection, the projecting parts of the ring with longitudinal ribs 26 have come to bear on the inner shoulder 2 of the casing and that the end of ring 3 is above the end of tool 28 at a good distance, for example 20 cm.
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