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Re:Breaks Observed in Rover Wheel Treads by mturmon on Wednesday March 22, 2017 @11:53AM (#13931908)
Here's a good reminder:

  http://i.imgur.com/3Hg9O.jpg
This shows engineering test models of Pathfinder, MER (Spirit/Opportunity), and Curiosity. It was taken in the Mars Yard at JPL, which engineered all three.

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