Sign support stand

The ornamental design for a sign support stand, substantially as shown and described.

FIG. 1 is a top front perspective view of a sign support stand, showing my new design; and

FIG. 2 is an exploded perspective view thereof taken from behind and below.

The broken line disclosure of the cards in FIG. 1 is for illustrative purposes only and forms no part of the claimed design.

Patent	Priority	Assignee	Title
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