CPC Main Group Additional Only
C21D 2221/00 Treating localised areas of an article
3 direct subcodes
Child Classifications
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- C21D 2221/01 End parts (e.g. leading, trailing end)
- C21D 2221/02 Edge parts
- C21D 2221/10 Differential treatment of inner with respect to outer regions, e.g. core and periphery, respectively