| http://www.w3.org/ns/prov#value | - Once tubulars 30, 34 are secured to insert 20, a dual bore wellhead 15 (FIG. 4) is secured to wellhead 6 by any suitable means, such as by bolts (not illustrated), and has two bores 16, 18 therethrough which are substantially aligned with tubulars 30, 34.
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