DIFF Subgroup
F28F 1/04 polygonal, e.g. rectangular
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Tubular elements; Assemblies of tubular elements > Tubular elements of cross-section which is non-circular > polygonal, e.g. rectangular
CPC:
Tubular elements; Assemblies of tubular elements (specially adapted for movement F28F5/00) > Tubular elements of cross-section which is non-circular (F28F1/08, F28F1/10 take precedence) > polygonal, e.g. rectangular
Of 1 combined children, 0 exist in both systems.
1 codes are CPC-only extensions.
Child Classifications
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