The broken line showing the circular features illustrated in 
 
                 Patent Grant
 Patent Grant
                     D637258
 D637258
                    
    
    
    
    
    
    
    
The broken line showing the circular features illustrated in 
| Number | Name | Date | Kind | 
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| 3492733 | Leatherwood | Feb 1970 | A | 
| 4395096 | Gibson | Jul 1983 | A | 
| 5111587 | Plank | May 1992 | A | 
| 5771595 | Bell | Jun 1998 | A | 
| D417679 | Cross et al. | Dec 1999 | S | 
| D421286 | Tucker | Feb 2000 | S | 
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| D619192 | Riley | Jul 2010 | S | 
| 20060107579 | Thomas | May 2006 | A1 |