(1) When taking their decisions the Boards of Appeal sit in a composition of
1. one legally qualified member acting as presiding judge and two technically qualified members in the cases referred to in section 23 (4) and in section 50 (1) and (2);
2. one technically qualified member acting as presiding judge, two further technically qualified members and a legally qualified member in those cases
a) in which the application was refused,
b) in which the opposition was dismissed as inadmissible,
c) referred to in section 61 (1) and in section 64 (1),
d) referred to in section 61 (2), and
e) referred to in sections 130, 131 and 133;
3. one legally qualified member acting as presiding judge, one further legally qualified member and one technically qualified member in the cases referred to in section 31 (5);
4. three legally qualified members in all other cases.
(2) The Nullity Board takes decisions in the cases referred to in sections 84 and 85 (3) sitting in a composition of one legally qualified member acting as presiding judge, one further legally qualified member and three technically qualified members, in all other cases sitting in a composition of three judges, one of whom must be a legally qualified member.