| http://www.w3.org/ns/prov#value | - a closure sleeve adapted to slide over the tubing hole; a drive mechanism mounted eccentrically on the tubing and suitable for moving the sleeve over a given path; and at least one intermediate part mounted on the tubing that co-operates with the tubing via a guide mechanism that defines the path and that co-operates with the sleeve via a coupling mechanism that is flexible except along the path a
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