Article 43
Taking of evidence by the Office 1. Where the Office considers it necessary to hear the oral evidence of parties, of witnesses or of experts or to carry out an inspection, it shall take a decision to that end, stating the means by which it intends to obtain evidence, the relevant facts to be proved and the date, time and place of the hearing or inspection. If oral evidence from witnesses and experts is requested by a party, the decision of the Office shall determine the period of time within which the party filing the request must make known to the Office the names and addresses of the witnesses and experts whom the party wishes to be heard. 2. The period of notice given in the summons of a party, witness or expert to give evidence shall be at least one month, unless they agree to a shorter time limit. The summons shall contain: (a) an extract from the decision mentioned in the first subparagraph of paragraph 1, indicating in particular the date, time and place of the hearing ordered and stating the facts regarding which the parties, witnesses and experts are to be heard; (b) the names of the parties to proceedings and particulars of the rights which the witnesses or experts may invoke pursuant to Article 45(2) to (5).