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			 The ornamental design for a headset, as shown and described. 
			  
			  
			  
			  
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The contrast in shading in 
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc | 
| Sep 13 2010 | Nokia Corporation | (assignment on the face of the patent) | / | |||
| Sep 24 2010 | HUANG, CHAO | Nokia Corporation | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 025085 | /0091 | |
| Apr 25 2014 | Nokia Corporation | Microsoft Mobile Oy | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 034471 | /0075 | |
| Apr 25 2014 | Nokia Corporation | Microsoft Mobile Oy | CORRECTIVE ASSIGNMENT TO CORRECT THE ASSIGNEE ADDRESS PREVIOUSLY RECORDED ON REEL 034471 FRAME 0075 ASSIGNOR S HEREBY CONFIRMS THE CORRECT ADDRESS IS KEILALAHDENTIE 2-4 | 034718 | /0723 | |
| Nov 30 2016 | Microsoft Mobile Oy | HMD Global Oy | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 041546 | /0246 | 
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