Patent classifications
G
PHYSICS
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G01
MEASURING; TESTING
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G01N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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27/00
Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
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G01N27/26
by investigating electrochemical variables; by using electrolysis or electrophoresis
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G01N27/4163
checking the operation of, or calibrating, the measuring apparatus
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G01N27/4165
for pH meters
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