Technically an Ipad is not an "Invention" it is a product. An invention is defined as "a useful process, or machine that did not exist previously", an Ipad is a tablet and tablets HAVE existed before the Ipad. The Ipad is just a tablet that has been greatly updated.
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The iPad is not an innovation. It is not the first touch screen computer, not the first tablet, not the first portable wifi or bluetooth or 3G device, not the first iOS device. It is the most successful tablet computer (including all portable computers).