The hatched areas of the straps of the headgear in
The dash-dot broken lines in
The hatched areas of the straps of the headgear in
The dash-dot broken lines in
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| Number | Date | Country | |
|---|---|---|---|
| Parent | 29719100 | Dec 2019 | US |
| Child | 29867898 | US | |
| Parent | 29618346 | Sep 2017 | US |
| Child | 29719100 | US |