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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
G01R19/0023—Measuring currents or voltages from sources with high internal resistance by means of measuring circuits with high input impedance, e.g. OP-amplifiers
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FR1123831D1955-03-211955-03-21Dispositif électrométrique utilisant des tubes électroniques ordinaires
ExpiredFR1123831A
(fr)