Patent classifications
G
PHYSICS
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G01
MEASURING; TESTING
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G01R
MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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23/00
Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
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G01R23/005
Circuits for comparing several input signals and for indicating the result of this comparison, e.g. equal, different, greater, smaller (comparing phase or frequency of 2 mutually independent oscillations in demodulators)
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