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The ornamental design for a surface of a blank, as shown and described.
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In the drawing views, the dash-dot broken line and the even broken line represent unclaimed portions of the surface of a blank and form no part of the claimed design.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Dec 17 2018 | Ivoclar Vivadent AG | (assignment on the face of the patent) | / | |||
| Feb 10 2020 | STEINKELLER, PETER | Ivoclar Vivadent AG | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 051857 | /0441 |
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