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The ornamental design for a bent spine board, as shown and described. |
FIG. 1 is a perspective view of the bent spine board embodying the design of the present invention;
FIG. 2 is a side elevational view thereof;
FIG. 3 is a side elevational view thereof;
FIG. 4 is an end elevational view thereof;
FIG. 5 is an end elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom view thereof.
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