Concrete building block

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

3. Concrete building block

3.1 : Perspective

3.2 : Front

3.3 : Back

3.4 : Top

3.5 : Bottom

3.6 : Right

3.7 : Left

3.8 : Cross sectional

The broken lines shown in FIGS. 3.1-3.8 illustrate portions of the concrete building block that form no part of the claimed design.

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Executed on	Assignor	Assignee	Conveyance	Frame	Reel	Doc
Jan 12 2022	SUGA, MASAAKI	ASURO CO , LTD	ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS	058997	0521	pdf

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