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| 3783861 | Abramson | Jan 1974 | A |
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| 8573222 | Weintraub | Nov 2013 | B2 |
| 9452082 | Lyytikainen | Sep 2016 | B2 |
| 20110162656 | Jutila | Jul 2011 | A1 |
| 20130255695 | Jutila | Oct 2013 | A1 |
| 20160217707 | Jutila | Jul 2016 | A1 |
| Number | Date | Country |
|---|---|---|
| 201042478 | Apr 2008 | CN |
| 29819558 | Feb 1999 | DE |
| 0798999 | Oct 1997 | EP |
| 1377063 | Feb 1988 | SU |
| 9618365 | Jun 1996 | WO |
| Entry |
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| Number | Date | Country | |
|---|---|---|---|
| Parent | 13119397 | US | |
| Child | 29558312 | US |