The first baseball trade in almost 30 years between two teams separated only by a bay and a bridge happened Saturday, when the San Francisco Giants and Oakland Athletics completed a deal. In a move to add experience to their bullpen, the A's got right-hander Burch Smith from the Giants for cash. The last time Oakland and San Francisco made a trade was on Dec. 4, 1990, when the Athletics acquired outfielder Ernest Riles from the Giants for outfielder Darren Lewis and minor league pitcher Pedro Pena.