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PCE
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CPC Subgroup
F28F 1/20

the means being attachable to the element (F28F1/22 takes precedence)

Full Title

Tubular elements; Assemblies of tubular elements (specially adapted for movement F28F5/00) > Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses (crimped or corrugated elements F28F1/06, F28F1/08) > the means being only outside the tubular element > and extending longitudinally (F28F1/38 takes precedence) > the means being attachable to the element (F28F1/22 takes precedence)