Display device having magnetically controlled plural indicia plates

Claim 1

IN COMBINATION WITH DATA PROCESSING APPARATUS, AN ARRAY OF PLURAL GROUPS OF VARIABLY POSITIONED INDICATING MEMBERS, SAID MEMBERS RESPECTIVELY HAVING ELECTROMAGNETICALLY RESPONSIVE ELEMENTS FIXED THERETO IN SPACE CODED RELATION, MEANS FOR STEADILY URGING THE MEMBERS OF SAID PLURAL GROUPS TOWARD A FIRST INDICATING POSITION, A LIKE PLURALITY OF GROUPS OF ELECTROMAGNETIC BIAS SIGNAL SOURCES FOR COOPERATION WITH SAID ELEMENTS TO URGE TH E MEMBERS OF SAID PLURAL GROUPS TO AN OPPOSITE, NON-INDICATING POSITION, MEANS FOR BRINGING SAID ELEMENTS RESPECTIVELY INTO IMMEDIATE PROXIMITY WITH SAID SOURCES FOR OVERCOMING SAID STEADILY URGING MEANS, MEANS FOR APPLYING A CONTROL SIGNAL SELECTIVELY TO GROUPS OF SAID SIGNAL SOURCES TO OPPOSE SAID BIAS SIGNAL THEREBY TO PLACE SAID SOURCES IN A THRESHOLD CONDITION FOR OVERCOMING SAID STEADILY URGING MEANS, AND MEANS FOR APPLYING INFORMATION SIGNALS TO SELECTED SOURCES OF SAID GROUPS IN COOPERATIVE RELATION WITH SAID CONTROL SIGNAL AND SAID URGING MEANS, THEREBY TO OVERCOME BIAS SIGNAL ACTION OF SAID SOURCES ON SELECTED ONES OF SAID ELEMENTS.