The ornamental design for an excavator, as shown and described.
The patent or application file contains at least one drawing executed in color. Copies of this patent or patent application publication with color drawing(s) will be provided by the Office upon request and payment of the necessary fee.
FIG. 1 is a perspective view of an excavator showing our new design;
FIG. 2 is another perspective view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a right side view thereof; and,
FIG. 5 is a rear view thereof.
The gray blurred portions illustrate structure or features which form no part of the claimed design.
The dashed broken lines illustrate structure or features which form no part of the claimed design.
The dot-dash broken lines illustrate boundaries which form no part of the claimed design.