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The ornamental design for protective face masks, as shown and described.
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1. Protective face mask
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| Jan 22 2021 | U-EARTH BIOTECH LTD | (assignment on the face of the patent) | ||||
| Apr 01 2021 | MAGGIO, ELISABETTA | U-EARTH BIOTECH LTD | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 055834 | 0812 |
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