Grade History

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Grade History
Does anyone know if the current (or the "improved") gradebook(s) keep track of the history of a grade? 

I've had situations where a student argued back a few points to both myself and a GTA, at which point the student could be credited for the correction twice, once by the professor, and once by the student.  Even if the grade "history" was only visible to the professor, it would be benefitial in these cases.