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H04M15/00—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP
H04M15/38—Charging, billing or metering by apparatus other than mechanical step-by-step counter type
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FR737388D1931-05-231932-05-21Appareil compteur ou enregistreur pour téléphone automatique
ExpiredFR737388A
(fr)