If, in order to arrive at the alleged invention, it is necessary to make a mosaic of extracts from documents published over a period of years1, taking suggestions from one with suggestions from others independent of it2, there can be little doubt that the claim has inventive subject matter3. This does not mean, however, that, in considering obviousness, prior documents must always be taken one at a time; the prior art must be considered as a whole4 but any 'mosaic' of the relevant documents must be one
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