Chain saw

FIG. 1 is a right side elevational view of a chain saw showing my new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a back side elevational view thereof;

FIG. 4 is front side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a perspective view thereof.

The broken lines in the drawings illustrate portions of the chain saw which form no part of the claimed design.