I claim the ornamental design for a cutter chain, as shown and described.
FIG. 1 is a right-front perspective view of the cutter chain;
FIG. 2 is a right side view of the cutter chain shown in FIG. 1;
FIG. 3 is a bottom view of the cutter chain shown in FIG. 1;
FIG. 4 is a top view of the cutter chain shown in FIG. 1;
FIG. 5 is a left side view of the cutter chain shown in FIG. 1;
FIG. 6 is a front view of the cutter chain shown in FIG. 1; and,
FIG. 7 is a rear view of the cutter chain shown in FIG. 1.
The subject matter shown in dashed lines, and any surfaces of the design not shown, including interior surfaces, form no part of the claimed invention.