Typewriter with error-correction features

Claim 1

AN ERROR CORRECTING TYPEWRITER COMPRISING CHARACTER-PRINTING MECHANISM INCLUDING PRINTING CONTROL KEYS, A PAPER SUPPORT MECHANISM, SPACING MEANS FOR STEPWISE MOVING SAID MECHANISMS RELATIVE TO ONE ANOTHER INA FORWARD DIRECTION IN RESPONSE TO OPERATION OF SAID KEYS TO ACCOMPLISH PRINTING OF A LINE OF CHARACTERS, RIBBON VBRATOR MEANS ACTUATED BY THE PRINTING CONTROL KEYS TO BRING A RIBBON FIELD MOMENTARILY INTO OPERAIVE POSITION UPON ACTUATION OF EACH OF SAID PRINTING CONTROL KEYS, A PRINTING RIBBON AND A PRINT-OBLITERATING RIBBON CARRIED BY SAID VIBRATOR MEANS FOR SELECTIVE PRESENTATION IN IMPRESSING POSITION, BACKSPACE DRIVE MEANS FOR STEPWISE MOVING SAID MECHANISMS RELATIVE TO ONE ANOTHER IN THE BACKWARD DIRECTION IN LETTER-WIDTH INCREMENTS, A RIBBONFIELD SELECTING CONTROL LEVER CONNECTED TO SAID VIBRATOR MEANS AND MOUNTED FOR MOVEMENT IN OPPOSITE DIRECTIONS FROM AN INTERMEDIATE REST POSITION TO SELECT THE PARTICULAR RIBBON FIELD WHICH WILL THEREAFTER BE PRESENTED AT THE IMPRESSION POSITION, MEANS BIASING SAID CONTROL LEVER TO RETURN TO ITS REST POSITION AFTER EACH MOVEMENT THEREOF, AND CONNECTIONS BETWEEN SAID CONTROL LEVER AND SAID BACKSPACED DRIVE MEANS FOR OPERATING THE LATTER UPON EACH MOVEMENT OF SAID LEVER IN EITHER DIRECTION AWAY FROM SAID REST POSITION.