Telegraph signal arrangement for a telephone system

Claim 1

IN COMBINATION WITH A TELEPHONE SYSTEM OF THE TYPE WHEREIN A CALLING AND A CALLED STATION ARE EACH EQUIPPED WITH TELEGRAPH SIGNALLING EQUIPMENT AND WHEREIN RINGING CURRENT IS EXTENDED TO SAID CALLED STATION ON THE ESTABLISHMENT OF A CONNECTION THERETO; APPARATUS AT SAID CALLED STATION AUTOMATICALLY RESPONSIVE TO THE RECEIPT OF SAID RINGING CURRENT THEREAT FOR TRANSMITTING A GO-AHEAD SIGNAL OVER SAID CONNECTION TO SAID CALLING STATION; MEANS AT SAID CALLING STATION RESPONSIVE TO THE RECEIPT OF SAID GO-AHEAD SIGNAL FOR AUTOMATICALLY OPERATING SAID TELEGRAPH SIGNALLING EQUIPMENT AT SAID CALLING STATION FOR TRANSMITTING A FIRST PREDETERMINED SEQUENCE OF TELEGRAPH SIGNALS FOLLOWED BY A GO-AHEAD SIGNAL TO SAID CALLED STATION; A FIRST MEANS AT SAID CALLED STATION OPERATIVE ONLY IN RESPONSE TO THE RECEIPT OF SAID FIRST PREDETERMINED SEQUENCE OF SIGNALS; A SECOND MEANS AT SAID CALLED STATION OPERATIVE IN RESPONSE TO SAID GO-AHEAD SIGNAL, WHENEVER RECEIVED AFTER SAID FIRST MEANS IS OPERATED, FOR AUTOMATICALLY OPERATING SAID TELEGRAPH SIGNALLING EQUIPMENT THEREAT TO TRANSMIT A TELEGRAPH MESSAGE TO SAID CALLING STATION.