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The ornamental design for a retractable double blade knife, as shown and described. |
FIG. 1 is a right side elevational view of a retractable double blade knife showing our new design;
FIG. 2 is a top plan view thereof.
FIG. 3 is a left side elevational view thereof.
FIG. 4 is a bottom plan view thereof.
FIG. 5 is a front elevational view thereof, the rear view being substantially the same.
Bartsch, Daniel, Bartsch, Jane A.
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