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The ornamental design for visual aid, as shown and described.
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FIG. 1 is a top view of a visual aid showing my new design;
FIG. 2 is a bottom view of the device.
FIG. 3 is a right side view of the device.
FIG. 4 is a left side view of the device.
FIG. 5 is a back view of the device.
FIG. 6 is a front side view of the device; and,
FIG. 7 is an isometric view of the device.
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| D635169, | May 21 2008 | Eric Beare Associates Ltd. | Magnifier with light |
| D645069, | Nov 24 2010 | Carson Optical, Inc. | Frame for a magnifying lens |
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
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