They're the brands you can't help but know, with logos that nearly everyone will recognize. They're companies founded back in the 1800s that became the major players in providing the products and services of the next century -- and the one after that. Names like AT&T and JP Morgan, Coca-Cola and John Deere. And while their logos have changed over time, the changes have been evolutionary, not revolutionary. Companies with this kind of brand recognition don't tamper with it lightly.