(1) The Federal Patent Court shall take evidence in the oral proceedings. In particular, it may carry out an inspection, hear witnesses, experts and parties, and consult documents.
(2) In appropriate cases, the Federal Patent Court may, even before the oral proceedings, have one of its members as a judge by commission take evidence or may request another court to take evidence by designation of the individual question regarding which evidence is to be taken.
(3) The parties shall be informed of all dates scheduled for the taking of evidence and may attend the taking of evidence. They may address relevant questions to witnesses and experts. Where a question is challenged, the Federal Patent Court shall decide.