Arrangements for metering, time-control or time indication

Child Classifications

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• H04M 15/04 Recording calls in printed, perforated or other permanent form
• H04M 15/07
• H04M 15/08 Metering calls to called party
• H04M 15/09
• H04M 15/10 Metering calls from calling party
• H04M 15/28 with meter at substation
• H04M 15/31
• 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
• H04M 15/39
• H04M 15/41
• H04M 15/42
• H04M 15/43
• H04M 15/44
• H04M 15/46
• H04M 15/47
• H04M 15/48
• H04M 15/49
• Show 27 more