The packaging for Oreo sandwich cookies may have changed over the past hundred years but the formula has not changed all that much: a white mystery cream squished between two black cookies. The Oreo marks a century milestone. Here is the original invoice from the National Biscuit Company, which eventually became Nabisco, dated March 6, 1912. Since then, Oreos have risen to $2 billion in annual sales from more than 100 countries, according to Kraft Foods, which now owns the Nabisco brand.
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