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The ornamental design for a convertible coupler, as shown and described. |
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FIG. 1 is a perspective view of a convertible coupler, showing my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is an elevational view of one side thereof;
FIG. 4 is an elevational view of one end thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is an elevational view of the other side thereof;
FIG. 7 is an elevational view of the other end thereof; and,
FIG. 8 is a sectional view thereof taken along line 8--8 of FIG. 2.
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