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The ornamental design for a roller bumper for chain saw bar, as shown. |
FIG. 1 is a perspective view of a roller bumper for chain saw bar showing my new design;
FIG. 2 is a right side elevational view as viewed in FIG. 1;
FIG. 3 is a bottom view thereof;
FIG. 4 is a left side elevational view as viewed in FIG. 1;
FIG. 5 is a front view; and,
FIG. 6 is a rear view.
The driving motor shown in broken lines in FIG. 1 denotes the nature and environmental use of the design and is not part of the design.
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