Russian émigrés Anatoly “Tony” and Leonid “Leo” Yuffa, founders of the 30-unit Dazbog Coffee Co. chain and roasting operation in Denver, say they are investing in technologies to reach, motivate and thank mobile-device using customers because history is repeating itself. “It’s one of those things like when they invented the fax machine - it changed how people did business. And then it [momentum] went to e-mail,” Leo Yuffa said. “I think mobile is really the [latest....