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The ornamental design for double layer soundproof earplug, as shown and described.
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The broken lines depict a portion of the double layer soundproof earplug that form no part of the claimed design.
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Sep 04 2020 | YUAN, JINNIU | SHENZHEN YUNDE TECHNOLOGY CO , LTD | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 053701 | /0004 | |
Sep 05 2020 | SHENZHEN YUNDE TECHNOLOGY CO., LTD. | (assignment on the face of the patent) | / |
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