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The ornamental design for a portable keyboard, as shown and described.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Jun 13 2014 | KIM, HYONL | LG Electronics Inc | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 033390 | /0992 | |
| Jun 13 2014 | CHA, JIYOUN | LG Electronics Inc | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 033390 | /0992 | |
| Jul 25 2014 | LG Electronics Inc. | (assignment on the face of the patent) | / |
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