The ornamental design for a manholeshieldretainer, as shown and described.
FIG. 1. Is a front perspective view of my manhole shield retainer with the
dotted lines shown being for illustrative purposes only and to which no
claim is made;
FIG. 2. Is a top view thereof with the bottom view being a substantial
mirror image thereof;
FIG. 3. Is a right side elevational view thereof;
FIG. 4. Is a front view thereof with the rear view being a substantial
mirror image thereof; and,