21 PORTABLE SELF-CONTAINED DEVICES CONSISTING OF A TWELVE-BUTTON PUSHBUTTON TELEPHONE DIAL UNIT CONTAINING A SMALL ELECTRIC TRANSISTOR BATTERY, CONNECTED BY A CABLE AND PLUG TO A SOUNDGENERATING UNIT SIMILAR TO A TELEPHONE RECEIVER EARPIECE, WHERE THE DIAL UNIT GENERATES THE SAME MULTI-FREQUENCY TONES USED IN TELEPHONE TONE-DIALING SYSTEMS, AND THE SOUND UNIT FEEDS THESE SOUNDS INTO THE MOUTHPIECE OF AN ORDINARY TELEPHONE HANDSET, SUCH ACOUSTIC COUPLING TRANSMITTING THE TONE-PAIRS TELEPHONICALLY TO A DISTANT TELEPHONE TO ACTUATE A DATA-PROCESSING DEVICE THERE, THUS TRANSMITTING INTELLIGENCE FROM THE LOCATION AT WHICH THE PORTABLE DEVICE IS USED
Trademark: 72309163
