| http://www.w3.org/ns/prov#value | - section, partly in elevation, through apparatus and -a tube formed thereby in accordance with the present method, with a single integral inner fin of a further modified arrangement; FIGS. 12 and 13 are fragmentary cross-sections taken on the lines 1212 and Lit-13, respectively, of FIG. l1; FIG. 14 is a fragmentary crosssection through apparatus and a tube formed thereby, in accordance with the pr
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