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The iPod, which made its debut 10 years ago, has reached sales of 300 million units globally.

“It took Sony 30 years to sell 220 million Walkman cassette players,” Cook said.

From http://www.businessweek.com/news/2011-10-05/apple-s-cook-to-woo-shoppers-without-pizazz-of-iphone-5.html
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