clarity; FIGS. 4A and 4B combined are an exploded perspective view of the elements comprising a pushbutton dial that is one of the major subassemblies of the call transmitter; FIG. 5 is a bottom view of the elements of FIG. 4A assembled; FIG. 6 is a perspective view of a repertory mechanism that is the other major subassembly of the call transmitter; FIG. 7 is a view taken along line 7-7 of FIG.