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PCE
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CPC Subgroup
G01J 1/38

using wholly visual means (G01J1/10 takes precedence)

Full Title

Photometry, e.g. photographic exposure meter (spectrophotometry G01J3/00; specially adapted for radiation pyrometry G01J5/00 ) > using wholly visual means (G01J1/10 takes precedence)

1 direct subcode

Child Classifications

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  • G01J 1/40 using limit or visibility or extinction effect