For income investors, sustainable and growing passive income is the name of the game. Dividend income at a low risk of being cut often grows over time. And when done right, this income grows as fast or faster than the rate of inflation to help an investor maintain or strengthen their purchasing power.

With a combined streak of 115 consecutive years of dividend growth, here are three blue-chip income stocks that investors should consider adding to their portfolios. 

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Source Fool.com