Third-party observations 

Third-party observations (E‑VI, 3) must be filed in writing and in one of the EPO's official languages. Supporting documents, e.g. prior art citations, can be written in any language.

If the third-party observations and/or prior art are not in an official language of the EPO (Art. 14(1) EPC), the EPO may invite the third party, if identifiable, to submit a translation of the observations and, where appropriate, of the cited prior art in an official language within a period according to Rule 132.

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