In Figures 2 and 3 of the drawing I have illustrated an index element or sub-element in which the key numerical equivalents l 5 are combined on the tab of the guide member (Fig. 3) of the index element. 0n the name member (Fig. 2) I have entered such names as Kahle, Kuhl, Kyle and Kiehl,-each .of which contains a letter, such as a, u, y, i ofthe division of the key 1, represented by the numerical