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The ornamental design for a heat transfer system, as shown. |
FIG. 1 is a perspective view of a heat transfer system, showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a side elevational view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is an end elevational view thereof;
FIG. 6 is an elevational view of the side opposite that shown in FIG. 3.
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