| http://www.w3.org/ns/prov#value | - Apparatus according to claim 1 including a pretreating station disposed between said oven and said moulding station, said pre-treating station comprising means for increasing the oven temperature of a first portion of said tubing length for thereafter decreasing the wall thickness thereof and means for decreasing the oven temperature of a second portion of said tubing length to retain said wall th
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