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The ornamental design for a placer mining sluice, as shown. |
FIG. 1 is a perspective view of a placer mining sluice showing my new design;
FIG. 2 is a left end elevational view thereof;
FIG. 3 is a right end elevational view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a rear elevational view thereof.
Messenger, Jack, Mathiesen, Viggo
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