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The ornamental design for a step stool, as shown and described.
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Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
Jul 23 2021 | ZHOU, XIAOYAN | TAIZHOU ERCHEN DANGJIA BABY PRODUCTS CO , LTD | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 056972 | /0084 | |
Jul 25 2021 | Taizhou Erchen Dangjia Baby Products Co., Ltd. | (assignment on the face of the patent) | / |
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