Telephone carrier system repeater and power supply

Telephone concentrator switch arrangement

Telephone cross connect status signal pre-processor

Telephone exchange

Telephone exchange conference circuit

Telephone exchange including service feature apparatus

Telephone exchange with time shared speech paths and selectively

Telephone information service system using digital and out-of-ba

Telephone line access apparatus

Telephone line access device for main distribution frame

Telephone line access system for main distribution frame

Telephone line carrier system

Telephone line circuit and system

Telephone line interface circuit

Telephone network coupler

Telephone or data switching system with variable protocol inter-

Telephone signal multiplexing system

Telephone signal transmission device

Telephone station carrier system

Telephone station set