Patent map and technology intelligence report. Telephonic CommunicationIntellectual Property ExchangeJanuary 24, 2010 15 Pages - SKU: ITR2583369 |
| Substation equipment, e.g. for use by subscribers; Automatic or semi-automatic exchanges; Manual exchanges; Interconnection arrangements between switching centers; Interconnection arrangements not involving centralized switching; Telephonic communication systems adapted for combination with other electrical systems; Party-line systems; Metering arrangements; Time-controlling arrangements; Time-indicating arrangements; Prepayment telephone systems; Current supply arrangements for telephone systems. |
