The skilled addressee has the common general knowledge relevant to the art in question1. Common general knowledge includes not only the information that those engaged in the particular art concerned are likely to remember2, but also the contents of those standard text books that those people would normally refer to on the particular topic concerned. In particular cases, a wider range of documents may form part of common general knowledge; thus patent specifications are not ordinarily common knowledge, but there are undoubtedly industries where specifications coming from leading research organisations are commonly read and referred to in the same
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