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49ers bubble watch: Considering Lawrence Okoye, Kaleb Ramsey, Mike Purcell

The San Francisco 49ers start up training camp in a month. We continue our pre-camp depth chart breakdown with a look at the defensive line. Previous bubble watch: QB | RB | FB | WR | TE | OL

The San Francisco 49ers are just over a month from their first practice of 2015 training camp. Once camp gets going, there will be daily media reports leading up to the preseason opener on August 15. That time will give us a better grasp on the depth chart, and which players have climbed onto the bubble.