| http://www.w3.org/ns/prov#value | - rings.It is also obvious that both the different embodiments can be combined, for example one embodiment can both include a lock mechanism arranged in the tube axis and lock mechanisms arranged at peripheral/external positions of the tube axis.EXAMPLEThe invention will be described in more detail below with references to the drawings, whereFIG. 1 is a cross section view of a first embodiment of th
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