Dictating machine with quick review apparatus

Claim 1

IN A DICATING MACHINE INCLUDING A ROTATABLE RECORD SUPPORT, A RECORD-REPRODUCE HEAD MOUNTED FOR TRAVELING MOVEMENT RELATIVE TO SAID SUPPORT, AND DRIVE MEANS FOR ROTATING SAID SUPPORT AND ADVANCING SAID HEAD; THE COMBINATION OF MANUAL SCAN CONTROL DEPRESSIBLE TO RELEASE SAID HEAD FROM SAID DRIVE MEANS AND SHIFTABLE WHILE IN A DEPRESSED POSITION TO BACKSPACE OR ADVANCE SAID HEAD ACROSS THE RECORD SUPPORT, A RECORD-REPRODUCE CONTROL AND MEANS RESPONSIVE THERETO FOR CONDITIONING SAID MACHINE RESPECTIVELY FOR RECORD AND REPRODUCE AS SAID RECORD-RE PRODUCE CONTROL IS SHIFTED INTO RECORD AND REPRODUCE POSITIONS, SPRING MEANS REPONSIVE TO DEPRESSING SAID SCAN CONTROL WHILE SAID MACHINE IS CONDITIONED FOR RECORDING FOR SHIFTING SAID MACHINE INTO REPRODUCE CONDITION AND CONCURRENTLY BIASING SAID RECORD-REPRODUCE CONTROL IN REPRODUCE POSITION, OTHER SPRING MEANS RENDERED OPERATIVE AS SAID RECORD-REPRODUCE CONTROL IS SHIFTED TO RECORD POSITION FOR BIASING SAID CONTROL INTO RECORD POSITION, AND MEANS RESPONSIVE TO RECIPROCATING SAID RECORD-REPRODUCE CONTROL FROM RECORD TO REPRODUCE POSITION AND BACK AGAIN FOR BACKSPACING SAID HEAD BY THE PITCH DISTANCE BETWEEN SUCCESSIVE TRACK CONVOLUTIONS FOR EACH RECIPROCATION.