<Tr> <Th> Release date </Th> <Td> <Ul> <Li> 1st gen: September 5, 2007 (2007 - 09 - 05) </Li> <Li> 2nd gen: September 9, 2008 (2008 - 09 - 09) </Li> <Li> 3rd gen: September 9, 2009 (2009 - 09 - 09) </Li> <Li> 4th gen: September 1, 2010 (2010 - 09 - 01) </Li> <Li> 5th gen: October 11, 2012 (2012 - 10 - 11) </Li> <Li> 6th gen: July 15, 2015 (2015 - 07 - 15) </Li> </Ul> </Td> </Tr> <Ul> <Li> 1st gen: September 5, 2007 (2007 - 09 - 05) </Li> <Li> 2nd gen: September 9, 2008 (2008 - 09 - 09) </Li> <Li> 3rd gen: September 9, 2009 (2009 - 09 - 09) </Li> <Li> 4th gen: September 1, 2010 (2010 - 09 - 01) </Li> <Li> 5th gen: October 11, 2012 (2012 - 10 - 11) </Li> <Li> 6th gen: July 15, 2015 (2015 - 07 - 15) </Li> </Ul> <Li> 1st gen: September 5, 2007 (2007 - 09 - 05) </Li> <Li> 2nd gen: September 9, 2008 (2008 - 09 - 09) </Li>

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