DIFF Subgroup
G01J 1/18 using comparison with a reference electric value
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Photometry, e.g. photographic exposure meter > by comparison with reference light or electric value > using electric radiation detectors > using comparison with a reference electric value
CPC:
Photometry, e.g. photographic exposure meter (spectrophotometry G01J3/00; specially adapted for radiation pyrometry G01J5/00 ) > by comparison with reference light or electric value > using electric radiation detectors (G01J1/20 takes precedence) > using comparison with a reference electric value
Of 2 combined children, 0 exist in both systems.
2 codes are CPC-only extensions.
Note: 2 CPC extensions are marked as secondary classification only.
Child Classifications
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