Frequency shift keyed data transmission system

Claim 1

A DATA COMMUNICATION SYSTEM COMPRISING: (A) A PLURALITY OF REMOTE DATA SECTIONS; (B) A CENTRAL DATA STATION; (C) TRANSMISSION LINE MEANS COUPLING EACH OF SAID REMOTE DATA STATIONS WITH SAID CENTRAL DATA STATION; (D) OSCILLATOR MEANS T EACH SAID REMOTE DATA STATIONS FOR GENERATING A FREQUENCY CONTROL SIGNAL AND TRANSMITTING SAME TO SAID CENTRAL DATA STATION; (E) MEANS AT SAID CENTRAL DATA STATION RESPONSIVE TO A FREQUENCY CONTROL SIGNAL FOR SELECTING THE REMOTE DATA STATION WHOSE CONTROL SIGNAL WAS TRANSMITTED; (F) FREQUENCY CONTROL SIGNAL GENERATING MEANS AT SAID CENTRAL DATA STATION RESPONSIVE TO THE FREQUENCY CONTROL SIGNAL FROM A REMOTE STATION FOR TRANSMITTING TO THE OPERATIVE REMOTE DATA STATION A SEND DATA FREQUENCY CONTROL SIGNAL; (G) MEANS AT THE OPERATIVE REMOTE DATA STATION RESPONSIVE TO THE SEND DATA FREQUENCY CONTROL SIGNAL FOR INITIATING A DATA TRANSMISSION OPERATIONS; (H) SOURCE DATA READING MEANS AT SAID OPERATIVE REMOTE DATA STATION BEING RESPONSIVE TO THE SEND DATA CONTROL SIGNAL TO ENABLE DATA READING OPERATIONS; (I) A PLURALITY OF FREQUENCY SIGNAL GENERATING MEANS RESPONSIVE TO THE SOURCE DATA READING MEANS FOR GENERATING CHARACTER REPRESENTING FREQUENCY SIGNALS ACCORDING TO A PREDETERMINED CODE CONFIRGURATION FOR TRANSMISSION TO SAID CENTRAL DATA STATION VIA ONE OF SAID TRANSMISSION LINES; (J) MEANS AT SAID CENTRAL DATA STATION FOR RECEIVING THE CODED FREQUENCY SIGNALS AND DECODING THEM; AND (K) MEANS FOR STORING THE DECODED DATA REPRESENTING SIGNALS.