Tesla Battery Plant

Rich Pedroncelli, file/AP Photo

FILE -- In this July 3, 2014 file photo, Assemblyman Steve Fox, D-Palmdale, listens to the state Senate debate his measure to give a tax credit to an aerospace contractor at the Capitol in Sacramento, Calif. Gov. Jerry Brown has signed Fox's bill, AB2389 which creates a $420 million tax credit for aerospace contractor Lockheed Martin that also includes language to help California-based electric car maker Tesla.

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