H04M - CPC Classification
Classification description:
Sub-classes:
- H04M1/00 » Substation equipment, e.g. for use by subscribers; Analogous equipment at exchanges 341
- H04M11/00 » Telephonic communication systems adapted for combination with other electrical systems 412
- H04M13/00 » Party-line systems 8
- H04M15/00 » Arrangements for metering, time-control or time indication {; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP} 2,2K
- H04M17/00 » Prepayment {of wireline communication systems, wireless communication systems or} telephone systems 507
- H04M19/00 » Current supply arrangements for telephone systems 90
- H04M2201/00 » Electronic components, circuits, software, systems or apparatus used in telephone systems 0
- H04M2203/00 » Aspects of automatic or semi-automatic exchanges 0
- H04M2207/00 » Type of exchange or network, i.e. telephonic medium, in which the telephonic communication takes place 2
- H04M2215/00 » Metering arrangements; Time controlling arrangements; Time indicating arrangements 16
- H04M2242/00 » Special services or facilities 3
- H04M2250/00 » Details of telephonic subscriber devices 2
- H04M3/00 » Automatic or semi-automatic exchanges 184
- H04M5/00 » Manual exchanges 11
- H04M7/00 » Interconnection arrangements between switching centres 99
- H04M9/00 » Interconnection arrangements not involving centralised switching 37
- H04M99/00 » Subject matter not provided for in other groups of this subclass 1
