By Tobias Carroll What does it mean to hear about a new factory opening its doors? A lot can depend on what’s actually being made there. Much has been written about Tesla’s plans to open a massive factory in Texas, for instance, but that’s only part of the story. Tesla’s own manufacturing efforts also include components made by other companies — and that’s what makes another piece of news about a different factory opening up so significant. Autoblog cites an NHK report stating that Panasonic has plans to open a new factory in the United States not far from Tesla’s new factory. The timeframe fo…