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The ornamental design for a sign support frame, as shown and described.
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FIG. 1 is a perspective view of a sign support frame of my new design;
FIG. 2 is a side elevational view thereof, the opposite side being a mirror image thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is an enlarged end elevational view thereof, the opposite end being a mirror image thereof;
FIG. 6 is an enlarged sectional view taken along line 6--6 of FIG. 2; and,
FIG. 7 is an enlarged sectional view taken along line 7--7 of FIG. 5.
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