Barbara series
The Barbara series was a group of five hundred identical androids who inhabited the planet Mudd. They were designed according to the personal specifications of Harry Mudd. 

The Barbara series was used as a model to describe to the crew of the  some of the engineering specifications of the Mudd androids. Covered with a self-renewing plastic over a skeleton of beryllium-titanium alloy, the duration of this model was estimated at 500,000 years. ()

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Androids