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Altering a patented web application

I'm working on a rewrite of a patented web application. When the application was patented couple of years ago, the original developer made some rather aged user interface choices (such as the style of ...
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A method claim dependent on an apparatus claim? (US7873522)

Regarding patent US7873522 (Measurement of spoken language training, learning and testing): I would like to know why dependent claim 18 begins "The method of claim 17..." when claim 17 is not a ...