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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G01R33/20 involving magnetic resonance
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G01R33/28 Details of apparatus provided for in groups G01R33/44 - G01R33/64
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G01R33/32 Excitation or detection systems, e.g. using radio frequency signals
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G01R33/36 Electrical details, e.g. matching or coupling of the coil to the receiver
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