G PHYSICS
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G01 MEASURING; TESTING
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G01R MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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G01R33/00 Arrangements or instruments for measuring magnetic variables
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G01R33/02 Measuring direction or magnitude of magnetic fields or magnetic flux
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G01R33/032 using magneto-optic devices, e.g. Faraday; or Cotton-Mouton effect
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