| http://www.w3.org/ns/prov#value | - rom the head and further actuable to prevent the tip from being withdrawn from the coupling means after the tip has been inserted into the coupling means, means for preventing fluid from escaping from the coupling means other than through the tip, the coupling means including a base mounted on the head, a lock nut screwed over the base, the base and lock nut defining a bore for removably receiving
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