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PCE
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Search for IPC and CPC classification codes or keywords
DIFF Subgroup
G01N 21/8901

Full Title

Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light (G01N3/00 - G01N19/00 take precedence) > Systems specially adapted for particular applications > Investigating the presence of flaws or contamination > in moving material, e.g. running paper or textiles (G01N21/90, G01N21/91, G01N21/94 take precedence)

Of 5 combined children, 0 exist in both systems.

5 codes are CPC-only extensions.

Note: 4 CPC extensions are marked as secondary classification only.