G‑IV, 4. Documents in a nonofficial language - Guidelines for Examination
Documents in a non‑official language 

If the applicant

disputes the relevance of a document in a non-official language cited in the search report (for procedure at the search stage, see B‑X, 9.1.2 and 9.1.3), and
gives specific reasons, 

the examiner should consider whether, in the light of these reasons and of the other prior art available to him, he is justified in pursuing the matter. If so, he should obtain a translation of the document (or merely the relevant part of it if that can be easily identified). If he remains of the view that the document is relevant, he should send a copy of the translation to the applicant with the next official communication.

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