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The ornamental design for a building block, as shown and described.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Apr 05 2012 | ANTAL, ISTVAN | WYW BLOCK AG | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 028084 | /0886 | |
| Apr 12 2012 | WYW BLOCK AG | (assignment on the face of the patent) | / |
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