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Claim 1

A DIGITAL READOUT DEVICE COMPRISING IN COMBINATION (A) IMAGE RECORD MEANS HAVING AT LEAST FOUR ITEMS OF INFORMATION RECORDED THEREON IN A PRESELECTED SPATIAL RELATION, (B) SOURCE MEANS FOR PRODUCING AN OPTICAL BEAM THAT ILLUMINATES SAID INFORMATION ITEMS SIMULTANEOUSLY, (C) MEANS FORMING A VIEWING SCREEN, (D) FIRST AND SECOND OPTICAL BEAM-SHIFTING MEANS (1) EACH OF WHICH ASSUMES ONLY FIRST AND SECOND DIFFERENT CONDITIONS IN RESPONSE TO DIFFERENT ELECTRICAL SIGNALS APPLIED THERETO, (2) SAID FIRST BEAM-SHIFTING MEANS DIRECTING SAID BEAM, AFTER IT IMPINGES ON SAID RECORD MEANS, TO FIRST AND SECOND DIFFERENT POSITIONS ON SAID SECOND BEAM-SHIFTING MEANS WHEN IT IS IN SAID FIRST AND SECOND CONDITIONS RESPECTIVELY, (3) SAID SECOND BEAM-SHIFTING MEANS DIRECTING SAID BEAM FROM EACH OF SAID FIRST AND SECOND POSITIONS TO DIFFERENT POSITIONS RELATIVE TO SAID VIEWING SCREEN WHEN IT IS IN SAID FIRST AND SECOND CONDITIONS RESPECTIVELY, (4) SO THAT EACH OF SAID INFORMATION ITEMS IS SEPARATELY PROJECTING ONTO SAID VIEWING SCREEN ACCORDING TO THE CONDITIONS OF SAID FIRST AND SECOND BEAM-SHIFTING MEANS, AND (E) AN OPTICALLY OPAQUE MASK, (1) HAVING MEANS FORMING AN OPTICALLY TRANSPARENT APERTURE THEREIN, (2) DISPOSED INTERMEDIATE SAID SECOND BEAM-SHIFTING MEANS AND SAID VIEWING SCREEN WITH SAID APERTURE IN OPTICAL ALIGNMENT WITH SAID VIEWING SCREEN, (F) SAID BEAM-SHIFTING MEANS BEING STRUCTURED TO PROJECT THROUGH SAID APERTURE ONLY THE INFORMATION ITEM TO BE DISPLAYED ON SAID VIEWING SCREEN.