CPC Main Group
F28F 1/00 Tubular elements; Assemblies of tubular elements (specially adapted for movement F28F5/00)
5 direct subcodes
Child Classifications
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- F28F 1/02 Tubular elements of cross-section which is non-circular (F28F1/08, F28F1/10 take precedence)
- F28F 1/08 Tubular elements crimped or corrugated in longitudinal section
- F28F 1/10 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)