Flip-up sunglasses

The ornamental design for flip-up sunglasses, as shown and described.

FIG. 1 is a front elevational view of flip-up sunglasses showing my new design;

FIG. 2 is a plan view thereof;

FIG. 3 is a right side elevational view thereof, the left side elevational view being a mirror image; and,

FIG. 4 is a rear elevational view thereof.

Patent	Priority	Assignee	Title
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D768761,	Oct 07 2014		Visor
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D792920,	Jun 18 2015	Dexerials Corporation	Protective cover for glasses
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