Telephone customer support utility

Telephone data collection device

Telephone data communication switching system

Telephone device capable of preventing unauthorized...

Telephone dial-inbound data acquisition system with demand readi

Telephone display

Telephone DTMF signal accessible data processor with calculator

Telephone exchange apparatus with facsimile broadcasting facilit

Telephone handset interface for alternating voice-data (AVD) mod

Telephone handset interface for automatic switching between voic

Telephone handset interface for automatic switching between voic

Telephone handset with full-page visual display

Telephone having convenience feature data transfer capability

Telephone interface call processing system with call selectivity

Telephone interface call processing system with call selectivity

Telephone interface call processing system with call selectivity

Telephone interface call processing system with call selectivity

Telephone interface call processing system with call...

Telephone interface circuit

Telephone interface for a computer for receiving and transmittin