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PCE
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CPC Subgroup
G01J 1/48

using chemical effects

Full Title

Photometry, e.g. photographic exposure meter (spectrophotometry G01J3/00; specially adapted for radiation pyrometry G01J5/00 ) > using chemical effects

3 direct subcodes

Child Classifications

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  • G01J 1/50 using change in colour of an indicator, e.g. actinometer
  • G01J 1/52 using photographic effects
  • G01J 1/54 by observing photo-reactions between gases