Patent ID: 7894582

Claim:
A telephone directory comprising: a plurality of pages, each page comprising a plurality of locations for a plurality of graphical depictions, and each page being moveable between a first position and a second position; a digital memory comprising a plurality of storage locations, each said storage location corresponding to a unique graphical depiction location on one of said pages and configured to store a digital representation of a telephone number associated with the corresponding graphical depiction location; a controller configured to: determine a selected one of said pages, and determine a selected one of said graphical depiction locations on said selected one of said pages; and a page sensor configured to output one or more signals indicative of a configuration of a stack of said pages in said first position, wherein said page sensor comprises a plurality of sensors each configured to direct a beam of energy into said stack of pages in said first position and receive a reflected beam reflected by said stack of pages, and each said sensor is further configured to determine an amount of energy in said reflected beam.