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The ornamental design for a swimming pool cofferdam, as shown and described
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FIG. 1 is a perspective view of a swimming pool cofferdam embodying my new design;
FIG. 2 is a top view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a bottom view thereof;
FIG. 5 is a front elevational view thereof; and,
FIG. 6 is a side elevational view, the opposite side being a mirror image thereof.
The broken line showing of swimming pool side and water level in FIG. 1 are for illustrative purposes only and form no part of the claimed design.
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