IPC Subgroup
H04M 15/04 Recording calls in printed, perforated, or other permanent form
Introduced: September 1968
Last revised: January 2006
Full Title
Arrangements for metering, time-control or time-indication > Recording calls in printed, perforated, or other permanent form
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- TELEPHONIC COMMUNICATION
1 direct subcode
Child Classifications
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- H04M 15/06 Recording class or number of calling party or called party