using chemical indicators (G01N31/02 takes precedence)

Full Title

Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods > using chemical indicators (G01N31/02 takes precedence)

Child Classifications

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• G01N 31/221
• G01N 31/222
• G01N 31/223
• G01N 31/226
• G01N 31/227
• G01N 31/228
• G01N 31/229