Abstract: A calculator adapted to be used with a push button telephone having an array of telephone push buttons for serving both as a calculator and as an enlarger for the push buttons to facilitate the actuation of them, includes a first array of finger discs corresponding to at least some of the telephone push buttons and extending from a cup-shaped housing having an open mouth adapted to fit over the array of telephone push buttons, the first array of finger discs enabling the user to actuate the telephone push buttons. Logic circuits are mounted within the housing for performing mathematical calculations, and a display device mounted on the housing responds to the logic circuits for indicating information concerning the calculations. A first set of switches are mounted on the housing and respond to the finger discs for causing the generation of input information for the logic circuits.

Abstract: An attachment adapted to be used with a push-button telephone having an array of telephone push buttons for facilitating the actuation of them, includes a series of finger discs corresponding to at least some of the telephone push buttons and bearing indicia on their upper faces, and a series of links fixedly connected to the lower faces of the discs extending to the telephone push buttons through apertures in a cup-shaped housing adapted to fit over the array of telephone push buttons which can be actuated by depressing the finger dics. At least some of the links are in the form of legs having an intermediate offset portion so that the upper faces of the discs may be larger in size and spaced further apart than the corresponding telephone push buttons to facilitate ready location of and manipulation of the finger discs.