Revision system for data recording and printing apparatus

Claim 1

DATA RECORDING AND PRINTING APPARATUS, COMPRISING: A PRINTER, SAID PRINTER HAVING A PLURALITY OF INFORMATIONAL AND FUNCTIONAL CHARACTER KEYS; MEANS IN SAID PRINTER RESPONSIVE TO DEPRESSION OF ANY INFORMATIONAL CHARACTER KEY FOR PRINTING THE RELATED CHARACTER; MEANS IN SAID PRINTER RESPONSIVE TO DEPRESSION OF ANY FUNCTION KEY FOR PERFORMING THE RELATED FUNCTION; RECORDING APPARATUS INTERCONNECTED WITH SAID PRINTER, SAID RECORDING APPARATUS HAVING FACILITIES FOR RECORDING CHARACTERS ON AND READING CHARACTERS FROM A REVISABLE RECORD MEDIA; MEANS IN SAID RECORDING APPARATUS RESPONSIVE TO DEPRESSION OF A PRINTER KEY TO RECORD A CODED CHARACTER IN SAID RECORD MEDIA REPRESENTING THE KEY DEPRESSED; MEANS FOR RELATIVELY MOVING SAID RESPONSIVE MEANS AND SAID RECORD MEDIA AS CHARACTERS ARE RECORDED SO THAT EACH CHARACTER OCCUPIES AN INCREMENT OF SPACE OF PREDETERMINED SIZE IN SAID RECORD MEDIA; AND MEANS IN SAID RECORDING APPARATUS AUTOMATICALLY OPERATIVE UPON DEPRESSION OF A PARTICULAR ONE OF SAID FUNCTION KEYS TO OPERATE SAID RELATIVE MOVING MEANS AND RECORD THE RELATED CHARACTER IN SAID RECORD MEDIA AND TO IMMEDIATELY THEREAFTER OPERATE SAID RELATIVE MOVING MEANS AGAIN SO THAT AT LEAST ONE REDUNDANT CHARACTER SPACE BEYOND THAT NORMALLY ALLOTTED DURING RECORDING OF CHARACTERS IS ESTABLISHED IN SAID RECORD MEDIA FOR EXPANSION OF RECORDED INFORMATION DURING SUBSEQUENT REVISION OF SAID RECORD MEDIA.