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The ornamental design for ergonomic putty knife, substantially as shown and described. |
FIG. 1 is a rear, left side perspective view of the ergonomic putty knife of the invention;
FIG. 2 is a front, right side perspective view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a left side elevational view thereof;
FIG. 7 is a top plan view thereof;
FIG. 8 is a bottom plan view thereof; and
FIG. 9 is a top perspective view thereof.
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