Bound book accessory

Claim 1

THE COMBINATION OF A BOUND BOOK WITH AN ACCESSORY CONSTITUTING A PERMANENT PART OF THE BOOK, COMPRISING HOLLOW FRAME MEANS ATTACHED TO THE STRUCTURE OF THE BOOK AND DISPOSED GENERALLY TO ONE SIDE OF THE PAGE ZONE OF THE BOOK, AND A SLIDE MEMBER OF STIFF MATERIAL COMPRISING AN INTEGRAL STEM PORTION SLIDABLE WITHIN SAID HOLLOW FRAME MEANS A DISTANCE WHICH SUBSTANTIALLY CORRESPONDS TO THE HEIGHT OF THE BOOK, SAID STEM PORTION HAVING LENGTH PROVIDING AN END THEREOF PROTRUDING FROM THE TOP OF THE BOOK, AN INTEGRAL WING PORTION PROJECTING LATERALLY FROM ONE SIDE OF SAID ONE END OF THE STEM PORTION AND GENERALLY WITHIN THE PLANE OF THE STEM PORTION THEREBY PROVIDING A PROJECTING END OF SAID WING PORTION WITHIN AN AREA OF EXTENSION OF THE WIDTH OF THE BOOK AT ITS TOP END, AN INTEGRAL DEPENDING PORTION DEPENDING FROM SAID PROJECTING END OF THE WING PORTION PARALLEL TO AND SPACED FROM SAID STEM PORTION AND GENERALLY WITHIN SAID PLANE OF THE LATTER, SAID DEPENDING PORTION HAVING LENGTH WHICH SUBSTANTIALLY CORRESPONDS TO THE HEIGHT OF THE BOOK THEREBY PROVIDING AN END OF THE DEPENDING PORTION POSITIONABLE BOTH ABOVE AND WITHIN THE AREA OF A PAGE OF THE BOOK, AND AN INTEGRAL OPAQUE SCREEN PORTION PROJECTING LATERALLY FROM ONE SIDE OF SAID END OF THE DEPENDING PORTION AND GENERALLY WITHIN SAID PLANE OF THE STEM PORTION A DISTANCE CORRESPONDING TO THE WIDTH OF A ZONE OF PRINTED MATTER ON SUCH PAGE OF THE BOOK, WHEREBY THE SCREEN PORTION MAY READILY BE INTRODUCED BETWEEN ANY TWO PAGES OF THE BOOK AND IS POSITIONABLE AT ANY LOCATION WITHIN THE HEIGHT OF SUCH PAGE OF THE BOOK TO PROGRESSIVELY COVER SUCH PRINTED MATTER, AND THEREAFTER UNCOVER THE SAME AT A READING LOCATION ABOVE THE SCREEN PORTION, BY SLIDABLY ADJUSTING SAID STEM PORTION WITHIN SAID HOLLOW FRAME MEANS.