Water tower sign frame

The ornamental design for a water tower sign frame, substantially as shown.

FIG. 1 is a perspective view of a water tower sign frame showing my new design;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a top plan view thereof; and

FIG. 4 is a bottom plan view thereof.

Patent	Priority	Assignee	Title
D324737,	May 18 1989	Royston Corporation	Canopy for a convenience store food preparation center
D731799,	May 22 2014	Umbra LLC	Picture frame
D856429,	Jun 02 2017	LG Electronics Inc	Digital signage with embedded lights
D911446,	Aug 09 2018	Target Brands, Inc.	Hanging marketing display

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