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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
G01R19/145—Indicating the presence of current or voltage
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FR69698D1956-04-171956-04-17Procédé de contrôle à distance d'une ligne sous tension alternative et dispositif pour la mise en oeuvre de ce procédé
ExpiredFR69698E
(fr)