Toy building block

The ornamental design for a toy building block, as shown and described.

FIG. 1 is a front elevational view of a toy building block showing my new design, the rear being plain;

FIG. 2 is a cross sectional view thereof taken on line 2--2 in FIG. 1; and

FIG. 3 is a perspective view thereof.

Patent	Priority	Assignee	Title
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D736568,	Apr 24 2013		Coaster
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D986337,	Jul 06 2021		Block stacking game piece

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52546,

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