On: California Opens Investigation into Tesla Workplac...

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There are quite a few parts in the Model S that come from suppliers. The steering wheel, window / mirror controls all appear to come from the same folks that supply Mercedes. I don't know where the parts for the Model 3 come from - the steering wheel and window / mirror controls are definitely different.

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Yes, but Tesla has the highest rate of vertical integration in the industry. In 2016, Goldman visited their factory and put it at 80% vertically integrated: https://www.valuewalk.com/2016/02/tesla-stock-rallies-after-...

And they've brought in house more since then (like the seats).

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For Model S i know that the parts for the air suspension are coming from the german companies Continental and Bilstein. The brakes are made by Brembo from Italy.