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H04M1/00—Substation equipment, e.g. for use by subscribers
H04M1/738—Interface circuits for coupling substations to external telephone lines
H04M1/74—Interface circuits for coupling substations to external telephone lines with means for reducing interference; with means for reducing effects due to line faults
H04M1/745—Protection devices or circuits for voltages surges on the line
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FR464544D1913-07-041913-07-04Dispositif automatique de sécurité pour téléphone
ExpiredFR464544A
(fr)