The ornamental design for a drywallcornertrimmingstrip with center projection, as shown and described.
FIG. 1 is a top front perspective view of a drywall corner trimming strip with center projection embodying my new design;
FIG. 2 is a top rear perspective view thereof;
FIG. 3 is a front view as viewed from the left-hand side of FIG. 1;
FIG. 4 is a rear view thereof;
FIG. 5 is an end view thereof; and,
FIG. 6 is an end view of an alternate embodiment of the drywall corner trimming strip with center projection, in which the flange are shown at an angle of 135 degrees to one another.
The openings and the fins in phantom lines form no part of the claimed design. The trimming strip is shown with portions cut away to indicate no specific length.