The broken lines in the drawings represent unclaimed subject matter.
The broken lines in the drawings represent unclaimed subject matter.
| Number | Name | Date | Kind |
|---|---|---|---|
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| 6230456 | Merchlewitz | May 2001 | B1 |
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| 6898914 | Folsom et al. | May 2005 | B2 |
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| 20020166297 | Plummer et al. | Nov 2002 | A1 |
| Number | Date | Country |
|---|---|---|
| 2106580 | Apr 1983 | GB |