The ornamental design for a lawmmower, as shown and described.
FIG. 1 is a perspective view of a lawn mower, showing my new design, the
broken line showing of the handle is for illustrative purposes only, and
forms no part of the claimed design;
FIG. 2 is an enlarged top plan view thereof;
FIG. 3 is an enlarged front elevational view thereof;
FIG. 4 is an enlarged rear elevational view thereof; and,
FIG. 5 is an enlarged side elevational view thereof, the other side being
identical.