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A top-up search is mandatory at the outset of PCT Chapter II, subject to some exceptions (see GL/PCT-EPO C‑IV, 5.2). The date – or absence – of this top-up search must be indicated in the IPER.
Rules 66.1ter and Rule 70.2(f) GL/ISPE 19.15, GL/ISPE 19.19-GL/ISPE 19.20