Summoning of parties, witnesses and experts 

The parties, witnesses and experts to be heard must be invited to appear to give evidence on the date fixed. The summons must be notified. At least two months' notice of a summons issued to a party, witness or expert to give evidence must be given, unless they agree to a shorter period. The summons must contain:

an extract from the order to take evidence, indicating in particular the date, time and place of the investigation ordered and stating the facts regarding which parties, witnesses and experts are to be heard; 
the names of the parties to the proceedings and particulars of the rights which the witnesses or experts may invoke (see E‑IV, 1.10); and
an indication that the party, witness or expert may request to be heard by the competent court of his country of residence and a requirement that he informs the EPO within a time limit to be fixed by the EPO whether he is prepared to appear before it (see E‑IV, 3.2.2 (iii) and (iv)).

Even if evidence is not taken in oral proceedings, all parties to the proceedings may attend an investigation. Parties not summoned are informed thereof within the period laid down in Rule 118(2), together with a statement that they may attend.

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