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			 The ornamental design for a cosmetic skin treatment apparatus, as shown and described. 
			  
			  
			  
			  
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The broken lines shown are included for the purpose of illustrating the unclaimed portions of the cosmetic skin treatment apparatus and form no part of the claimed design.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc | 
| Apr 16 2018 | MTG CO., LTD. | (assignment on the face of the patent) | / | |||
| May 07 2018 | MATSUSHITA, TSUYOSHI | MTG CO , LTD | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 045936 | /0453 | 
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