(2)17 An Examining Division shall consist of three technically qualified examiners. However, before a decision is taken on a European patent application, its examination shall, as a general rule, be entrusted to one member of the Examining Division. Oral proceedings shall be before the Examining Division itself. If the Examining Division considers that the nature of the decision so requires, it shall be enlarged by the addition of a legally qualified examiner. In the event of parity of votes, the vote of the Chairman of the Examining Division shall be decisive.