The ornamental design for a electric cordretainingguard, as shown and described.
FIG. 1 is a perspective view of an electric cord retaining guard showing my
new design;
FIG. 2 is a left end view thereof;
FIG. 3 is a right side view of an electric cord retaining guard showing a
second embodiment of my new design. The second embodiment is the same as
the first except for the indeterminate length indicated by the symbolic
break;