The ornamental design for a portablehalf-step stairway unit, substantially as shown and described.
FIG. 1 is a perspective view of a portable half-step stairway unit showing
my new design;
FIG. 2 is a further perspective view thereof, on a reduced scale, together
with broken lines representing an associated stairway and other like units
shown for illustrative purposes in relation to environmental structure and
not being part of my claimed design;
FIG. 3 is a front elevational view thereof, the rear elevational view
thereof being the same;
FIG. 4 is a side elevational view thereof, looking toward the right side
thereof as it appears in FIG. 1, the side elevational view looking toward
the left side thereof being the same; and
FIG. 5 is a top plan view thereof; the bottom plan view thereof being the
same.