Data transfer system and handheld terminal device used therefor

Data transmission and storage

Data transmission apparatus and data reception apparatus

Data transmission arrangement

Data transmission over a communication line

Data transmission over an in-use transmission medium

Data transmission over the public switched network

Data transmission processing machine

Data transmission system

Data transmitting/receiving apparatus and data communication sys

Data transmitting/receiving apparatus and data communication sys

Data-only telephone service

Data/facsimile telephone subset apparatus incorporating electrop

Data/facsimile telephone subset apparatus incorporating electrop

Dedicated data modem system and method

Dedicated data modem system and method

Dedicated line eliminator for facsimile/telephone systems

Delivery of customer data base key using automatic number identi

Delivery-information management method and...

Detection and authentication of multiple integrated receiver...