The San Francisco 49ers have set out to build the most technologically advanced stadium in history. We might consider it a small upset, then, that they have secured a naming-rights sponsor known for producing blue jeans pretty much the same way since 1873.Levi's Stadium joins CenturyLink Field, University of Phoenix Stadium and the Edward Jones Dome among sponsored playing venues in the NFC West.The 20-year agreement for naming rights could be worth $220 million, enough to purchase 4.