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Needs 'age' added --59.101.13.133 00:02, 4 March 2007 (UTC)
Some of these aren't units of time, but units of frequency. For instance, time can be measured in seconds, while frequency can be measured in seconds^-1. —Preceding unsigned comment added by 69.202.84.165 (talk) 20:19, 14 November 2007 (UTC)