The broken away ends indicate that the hollow wall base has no specific length.
The broken away ends indicate that the hollow wall base has no specific length.
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| Number | Date | Country |
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| WO 02066764 | Aug 2002 | WO |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 12148082 | Apr 2008 | US |
| Child | 29429098 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 11174832 | Jul 2005 | US |
| Child | 12148082 | US |