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The ornamental design for a putty knife, substantially as shown. |
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FIG. 1 is a perspective view of a putty knife showing our new design;
FIG. 2 is a rear elevational view thereof;
FIG. 3 is a left side elevational view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof; and
FIG. 6 is an elevational view of an alternative embodiment thereof.
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