The ornamental design for a telephoneinstrumentbasehousing, as shown and described.
FIG. 1 is a perspective view of a telephone instrument base housing,
showing my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is an elevational view of one side thereof, the opposite side being
a mirror image of the side shown; and
FIG. 4 is a side elevational view thereof orthogonal to the elevational
view shown in FIG. 3, the opposite side being a mirror image of the side
shown.