CPC Main Group
H04M 15/00 Arrangements for metering, time-control or time indication
47 direct subcodes
Child Classifications
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- H04M 15/04 Recording calls in printed, perforated or other permanent form
- H04M 15/08 Metering calls to called party
- H04M 15/10 Metering calls from calling party
- H04M 15/28 with meter at substation
- H04M 15/32 metering arrangements for satellites or concentrators which connect one or more exchange lines with a group of local lines
- H04M 15/34 metering arrangements for private branch exchanges
- H04M 15/36 metering arrangements for party-lines
- H04M 15/38 metering by apparatus other than mechanical step-by-step counter type