| Number | Date | Country | Kind |
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| 202030294792.4 | Jun 2020 | CN | national |
| Number | Name | Date | Kind |
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| 7365703 | Nasvall | Apr 2008 | B2 |
| 8686896 | Schuman | Apr 2014 | B2 |
| 9696419 | Mitchell | Jul 2017 | B2 |
| 10050330 | McAllister | Aug 2018 | B2 |
| 10069214 | Hooper | Sep 2018 | B1 |
| 20170025736 | McAllister | Jan 2017 | A1 |
| Number | Date | Country |
|---|---|---|
| 111740207 | Oct 2020 | CN |