(under subclass 444.1) Device for supporting a book in open position and including means for maintaining the two halves of the open face of the book in substantially the same horizontal plane, regardless of the relative thickness of the two halves of the book.
SEE OR SEARCH THIS CLASS, SUBCLASS:
188.2+, for a supporting substructure for a stand including means for adjustment of the device up or down with respect to the surface upon which it rests, or means to compensate for unevenness or irregularity in said surface.
