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The ornamental design for a depth sounder, as shown. |
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FIG. 1 is a top, front perspective view of a depth sounder showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view; the opposite side being substantially a mirror image; and
FIG. 5 is a bottom plan view thereof.
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