Audio-visual teaching apparatus

Claim 1

A PRACTICE TEACHING MACHINE COMPRISING A PRACTICE RECORDER UNIT HAVING A RECORDING MEDIUM PROVIDED WITH A MASTER TRACK SECTION AND A STUDENT TRACK SECTION IN SIDE BY SIDE RELATION, WITH THE STUDENT TRACK SECTION HAVING A BEGINNING POINT AT THE END POINT OF THE MASTER TRACK SECTION AND WITH THE MASTER TRACK SECTION HAVING A BEGINNING POINT AT THE END POINT OF THE STUDENT TRACK SECTION, A SEQUENCING DEVICE CONNECTED TO CONTROL SAID PRACTICE RECORDER UNIT, MEANS FOR RECORDING A MASTER MESSAGE AND A CONTROL SIGNAL IN THE MASTER TRACK SECTION OF SAID PRACTICE RECORDER UNIT, MEANS CONCURRENTLY OPERABLE FOR PLAYING BACK SAID MASTER MESSAGE AND SAID CONTROL SIGNAL FROM THE MASTER TRACK SECTION OF SAID PRACTICE RECORDED UNIT TO ACTUATE SAID SEQUENCING DEVICE, MEANS RESPONSIVE TO ACTUATION OF SAID SEQUENCING DEVICE FOR CONNECTING SAID PRACTICE RECORDER UNIT TO RECEIVE AND RECORD A PRACTICE MESSAGE IN THE STUDENT TRACK SECTION AND FOR AGAIN PLAYING BACK SAID RECORDED CONTROL SIGNAL TO ACTUATE SAID SEQUENCING DEVICE, MEANS THEREUPON RESPONSIVE TO ACTUATION OF SAID SEQUENCING DEVICE FOR PLAYING BACK SAID RECORDED MASTER MESSAGE FROM SAID PRACTICE RECORDER UNIT AND FOR PLAYING BACK SAID RECORDED CONTROL SIGNAL TO AGAIN ACTUATE SAID SEQUENCING DEVICE, AND MEANS THEREUPON RESPONSIVE TO ACTUATION OF SAID SEQUECING DEVICE FOR PLAYING BACK SAID RECORDED STUDENT MESSAGE FROM SAID PRACTICE RECORDER UNIT, AND FOR PLAYING BACK SAID CONTROL SIGNAL TO ACTUATE SAID SEQUENCING DEVICE, AND MEANS RESPONSIVE TO THE LAST-MENTIONED ACTUATION OF SAID SEQUENCING DEVICE FOR RESETTING THE SEQUENCING DEVICE FOR ANOTHER CYCLE OF OPERATION.