28Although the first subparagraph of Rule 50(1) lays down the principle that the provisions relating to proceedings before the department which has made the decision against which the appeal is brought are to be applicable to appeal proceedings mutatis mutandis, the third subparagraph of Rule 50(1) constitutes a special rule derogating from that principle. That special rule is specific to the appeal proceedings brought against the Opposition Division’s decision and specifies the rules, before the Board of Appeal, governing the facts and evidence submitted after the expiry of the time-limits set or specified at first instance.
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