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The ornamental design for a telephone off-hook indicator, as shown. |
FIG. 1 is a perspective view of the ornamental design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a right end elevational view thereof;
FIG. 5 is a left end elevational view thereof;
FIG. 6 is a front side elevational view thereof; and,
FIG. 7 is a rear side elevational view thereof.
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