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The ornamental design for a dental floss holder, as shown. |
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FIG. 1 is a plan view of a dental floss holder showing our new design;
FIG. 2 is a side elevation thereof;
FIG. 3 is a front elevation thereof;
FIG. 4 is a rear elevation thereof; and
FIG. 5 is an isometric view thereof.
Dennesen, Joseph C., Chisholm, Colin F.
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