Patent ID: 8070492

Claim:
A decoding reading tool comprising: a) a page overlay, being generally rectangular and having a top, a bottom, a right side a left side, a height, and a rectangular window having a height, a length and a lateral axis formed therein, whereby the height of said page overlay being at least 5 times as large as the height of said rectangular window; and b) a sliding cover, having a semi circular shape, pivotably attached to said page overlay at a pivot point at the top of said page overlay, said movable sliding cover also having two control tabs, spaced apart on said sliding cover, and a convex arcuate trailing edge, a height and a width, and further wherein the height of said sliding cover being at least 5 times the height of said rectangular window and the width of said slider being larger than the length of said rectangular window, and further wherein said arcuate trailing edge being formed such that trailing edge of the slider is generally perpendicular to the lateral axis of the slot at any position on said rectangular window.