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G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
G01R19/12—Measuring rate of change
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FR1075219D1952-12-161952-12-16
Improvements in electrical measuring devices, in particular sinusoidal alternating voltage measuring devices
ExpiredFR1075219A
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