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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
H04M15/10—Metering calls from calling party, i.e. A-party charged for the communication
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FR577423D1924-02-191924-02-19
Improvements to phones
ExpiredFR577423A
(en)