In this articleTSLACEO of Tesla Motors Elon Musk waves after ringing the opening bell at the NASDAQ market in celebration of his company's initial public offering in New York June 29, 2010.Brendan McDermid | ReutersAt the time of Tesla's IPO 15 years ago, the company had generated roughly $150 million in revenue in its lifetime. That came almost entirely from the Roadster, a two-seat electric sportscar that boasted a range of 236 miles on a single charge.The Model S sedan was still in the lab, two years awa ...