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Apple says its e-book software has a unique page-turning animation - although the uniqueness isn't immediately obvious from three illustrations used to support the company's filing.
One shows a page beginning to turn, the second the page turning a bit more, and the third the page turning a bit more again.
To the layman, it might look silly.
But to an army of lawyers it will look like another motherlode as Apple swaps smartphone and tablet patent lawsuits in its worldwide fight with Google, Samsung and others in the Android camp.