DIFF Subgroup
G01N 21/8806 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
Of 9 combined children, 0 exist in both systems.
9 codes are CPC-only extensions.
Note: 9 CPC extensions are marked as secondary classification only.