The ornamental design for a cornerconnector for a showcase, substantially as shown and described.
FIG. 1 is a perspective view of a corner connector for a showcase which
shows my design wherein the same is fragmentarily depicted to indicate
indeterminate length; and
FIG. 2 is a sectional end view.
The surfaces of the corner connector for a showcase which are not shown in
FIGS. 1 and 2 are conventionally flat and unadorned.