This revised version of the Guidelines for Examination will apply as from 1 November 2015. Until then, the September 2014 edition of the Guidelines remains valid.

9.2.5 Documents relating to the theory or principle underlying the invention

Where a document cited in the search report may be useful for a better understanding of the principle or theory underlying the invention, or is cited to show that the reasoning or the facts underlying the invention are incorrect, it should be indicated by the letter "T".

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