Tele printer abd exchange machine send the doccuments through phone cables by electrical signals to the other telex machine where original print is recieved. But before converting the doccument into electrical signals, it has to be typed on telex machine... Now itz use is abolished to some extent .....
Telex refers to the preparation of long-distance exchange printed form, with the convenience of quick, simple procedures, automatically sending and receiving, efficient and economic advantages.