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"I must have an earlier version, as the front only refers to ADD, SUBTRACT, MULTIPLY. The printed instructions, however adds AID IN DIVIDING to the list. Further, the stylus attached is very plain in its design. The Personal Computer Museum indicates the product's release date of 1/1/60, and pictures a device with only the four functions on the face., Thoresen's address on mine is given as 585 Water Street New York 2, NY - which would indicate the device must have been made before the implementation of ZIP codes in the early 1960's."